forked from docs/doc-exports
wangdengke2
06c8ac5e62
Reviewed-by: Wagner, Fabian <fabian.wagner@t-systems.com> Co-authored-by: wangdengke2 <wangdengke2@huawei.com> Co-committed-by: wangdengke2 <wangdengke2@huawei.com>
1532 lines
60 KiB
JSON
1532 lines
60 KiB
JSON
[
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{
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"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
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"product_code":"opengauss",
|
|
"title":"Service Overview",
|
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"uri":"opengauss_01_0001.html",
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|
"doc_type":"usermanual",
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|
"p_code":"",
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"code":"1"
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|
},
|
|
{
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"desc":"GaussDB is a distributed relational database. It supports intra-city cross-AZ deployment. With a distributed architecture, GaussDB supports petabytes of storage and conta",
|
|
"product_code":"opengauss",
|
|
"title":"What Is GaussDB?",
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"uri":"opengauss_01_0002.html",
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|
"doc_type":"usermanual",
|
|
"p_code":"1",
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|
"code":"2"
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|
},
|
|
{
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|
"desc":"Transaction applicationsThe distributed, highly scalable architecture of GaussDB makes it an ideal fit for highly concurrent online transactions containing a large volume",
|
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"product_code":"opengauss",
|
|
"title":"Scenarios",
|
|
"uri":"opengauss_02_0012.html",
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"doc_type":"usermanual",
|
|
"p_code":"1",
|
|
"code":"3"
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|
},
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|
{
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|
"desc":"The smallest management unit in GaussDB is the instance. A DB instance is an isolated database environment hosted in the cloud. You can create and manage GaussDB instance",
|
|
"product_code":"opengauss",
|
|
"title":"Basic Concepts",
|
|
"uri":"opengauss_01_0003.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"1",
|
|
"code":"4"
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|
},
|
|
{
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|
"desc":"High SecurityGaussDB provides a wide range of features to let you enjoy the security of top-level commercial databases at a low cost: dynamic data masking, transparent da",
|
|
"product_code":"opengauss",
|
|
"title":"Advantages",
|
|
"uri":"opengauss_01_0004.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"1",
|
|
"code":"5"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"DB Instance Description",
|
|
"uri":"opengauss_01_0005.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"1",
|
|
"code":"6"
|
|
},
|
|
{
|
|
"desc":"The status of a DB instance reflects the health of the instance. You can use the management console to view the status of a DB instance.",
|
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"product_code":"opengauss",
|
|
"title":"Instance Statuses",
|
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"uri":"opengauss_01_0006.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"6",
|
|
"code":"7"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
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"title":"Instance Specifications",
|
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"uri":"opengauss_01_0007.html",
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"doc_type":"usermanual",
|
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"p_code":"6",
|
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"code":"8"
|
|
},
|
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{
|
|
"desc":"GaussDB provides ultra-high I/O storage with up to 350 MB/s of throughput.",
|
|
"product_code":"opengauss",
|
|
"title":"Instance Storage Types",
|
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"uri":"opengauss_01_0090.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"6",
|
|
"code":"9"
|
|
},
|
|
{
|
|
"desc":"Currently, GaussDB V2.0-8.102, V2.0-3.223, V2.0-3.222, and V2.0-3.208 are supported.",
|
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"product_code":"opengauss",
|
|
"title":"Instance Versions",
|
|
"uri":"opengauss_01_0008.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"6",
|
|
"code":"10"
|
|
},
|
|
{
|
|
"desc":"If you need to assign different permissions to employees in your company to access your GaussDB resources, IAM is a good choice for fine-grained permissions management. I",
|
|
"product_code":"opengauss",
|
|
"title":"Permissions Management",
|
|
"uri":"opengauss_01_0009.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"1",
|
|
"code":"11"
|
|
},
|
|
{
|
|
"desc":"To ensure the stability and security of GaussDB, certain constraints are put in place for access or permissions control. Table 1 describes such constraints.",
|
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"product_code":"opengauss",
|
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"title":"GaussDB Notes and Constraints",
|
|
"uri":"opengauss_01_0013.html",
|
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"doc_type":"usermanual",
|
|
"p_code":"1",
|
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"code":"12"
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|
},
|
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{
|
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"desc":"Table 1 shows the relationship between GaussDB and other services.",
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"product_code":"opengauss",
|
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"title":"Related Services",
|
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"uri":"opengauss_01_0012.html",
|
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"doc_type":"usermanual",
|
|
"p_code":"1",
|
|
"code":"13"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Getting Started",
|
|
"uri":"opengauss_01_0014.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"",
|
|
"code":"14"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Operation Guide",
|
|
"uri":"opengauss_mix_0001.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"14",
|
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"code":"15"
|
|
},
|
|
{
|
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"desc":"You can create a DB instance on the management console.After the configuration, click Price Calculator to view the price of your DB instance with its current configuratio",
|
|
"product_code":"opengauss",
|
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"title":"Creating a DB Instance",
|
|
"uri":"opengauss_01_0018.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"14",
|
|
"code":"16"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Connecting to a DB Instance Using a Database Client",
|
|
"uri":"opengauss_01_0025.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"14",
|
|
"code":"17"
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|
},
|
|
{
|
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"desc":"GaussDB instances can be connected using Data Admin Service (DAS), over a private network, or a public network.",
|
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"product_code":"opengauss",
|
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"title":"Connecting to a DB Instance",
|
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"uri":"opengauss_01_0015.html",
|
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"doc_type":"usermanual",
|
|
"p_code":"17",
|
|
"code":"18"
|
|
},
|
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{
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"desc":"DAS enables you to manage your databases from a web-based console. It supports SQL execution, advanced database management, and intelligent O&M, simplifying database mana",
|
|
"product_code":"opengauss",
|
|
"title":"Connecting to an Instance Through DAS",
|
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"uri":"opengauss_01_0019.html",
|
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"doc_type":"usermanual",
|
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"p_code":"17",
|
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"code":"19"
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|
},
|
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{
|
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"desc":"You can create a GaussDB instance on the console and connect from an ECS to a GaussDB instance over a private network.If you want to connect to a database using the comma",
|
|
"product_code":"opengauss",
|
|
"title":"Connecting to an Instance over a Private Network",
|
|
"uri":"opengauss_01_0024.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"17",
|
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"code":"20"
|
|
},
|
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{
|
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"desc":"By default, GaussDB instances are not publicly accessible (no EIP bound). You can bind an EIP to a GaussDB instance for public access and then unbind the EIP when public ",
|
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"product_code":"opengauss",
|
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"title":"Connecting to a DB Instance over a Public Network",
|
|
"uri":"opengauss_01_0030.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"17",
|
|
"code":"21"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Connecting to a DB Instance Using a Driver",
|
|
"uri":"opengauss_opti_0001.html",
|
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"doc_type":"usermanual",
|
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"p_code":"14",
|
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"code":"22"
|
|
},
|
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{
|
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"desc":"If the connection pool mechanism is used during application development, comply with the following guidelines before you return the connection to the connection pool:If G",
|
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"product_code":"opengauss",
|
|
"title":"Development Guidelines",
|
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"uri":"opengauss_opti_0002.html",
|
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"doc_type":"usermanual",
|
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"p_code":"22",
|
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"code":"23"
|
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},
|
|
{
|
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"desc":"Download the GaussDB driver package GaussDB_opengauss_client_tools.zip.Java JDK 8 has been installed on the local PC.You can load the driver using either of the following",
|
|
"product_code":"opengauss",
|
|
"title":"Using JDBC to Connect to a Database",
|
|
"uri":"opengauss_jdbc_connect.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"22",
|
|
"code":"24"
|
|
},
|
|
{
|
|
"desc":"Open Database Connectivity (ODBC) is an application programming interface (API) for accessing databases based on the X/OPEN CLI. The ODBC API alleviates applications from",
|
|
"product_code":"opengauss",
|
|
"title":"Using ODBC to Connect to a Database",
|
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"uri":"opengauss_odbc_connect.html",
|
|
"doc_type":"usermanual",
|
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"p_code":"22",
|
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"code":"25"
|
|
},
|
|
{
|
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"desc":"libpq is a C application programming interface to GaussDB. libpq contains a set of library functions that allow client programs to send query requests to GaussDB servers ",
|
|
"product_code":"opengauss",
|
|
"title":"Using libpq to Connect to a Database",
|
|
"uri":"opengauss_libpg_connect.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"22",
|
|
"code":"26"
|
|
},
|
|
{
|
|
"desc":"Psycopg is a Python API used to execute SQL statements and provides a unified access API for PostgreSQL and GaussDB databases. It is designed for applications that perfor",
|
|
"product_code":"opengauss",
|
|
"title":"Using Psycopg to Connect to a Database",
|
|
"uri":"opengauss_Psycopg_connect.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"22",
|
|
"code":"27"
|
|
},
|
|
{
|
|
"desc":"This section describes how to create a GaussDB instance with the minimum specifications and execute basic SQL syntax.The VPC you selected must contain sufficient subnets.",
|
|
"product_code":"opengauss",
|
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"title":"Example: Using DAS to Connect to an Instance and Execute SQL Statements",
|
|
"uri":"opengauss_trial.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"14",
|
|
"code":"28"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Working with GaussDB",
|
|
"uri":"opengauss_01_0031.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"",
|
|
"code":"29"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Performance Tuning",
|
|
"uri":"opengauss_opti_0003.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"30"
|
|
},
|
|
{
|
|
"desc":"To fine-tune GaussDB performance, you need to identify performance bottlenecks, adjust key parameters, and optimize SQL statements. During the tuning, factors such as sys",
|
|
"product_code":"opengauss",
|
|
"title":"Performance Tuning Process",
|
|
"uri":"opengauss_opti_0020.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"30",
|
|
"code":"31"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Performance Tuning Scope",
|
|
"uri":"opengauss_opti_0021.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"30",
|
|
"code":"32"
|
|
},
|
|
{
|
|
"desc":"This section describes how to identify SQL statements whose execution takes a long time, leading to poor system performance.The command output lists the query statements ",
|
|
"product_code":"opengauss",
|
|
"title":"Querying the Most Time-Consuming SQL Statements",
|
|
"uri":"opengauss_opti_0027.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"32",
|
|
"code":"33"
|
|
},
|
|
{
|
|
"desc":"During database running, if query statements are blocked and executed for an excessively long time, you can forcibly terminate the faulty sessions.The command output incl",
|
|
"product_code":"opengauss",
|
|
"title":"Checking Blocked Statements",
|
|
"uri":"opengauss_opti_0028.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"32",
|
|
"code":"34"
|
|
},
|
|
{
|
|
"desc":"Database parameters are key configuration items in a database system. Improper parameter settings may adversely affect database performance. This section describes some i",
|
|
"product_code":"opengauss",
|
|
"title":"Tuning Parameters",
|
|
"uri":"opengauss_Parameter_optimization.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"32",
|
|
"code":"35"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"SQL Tuning Guide",
|
|
"uri":"opengauss_opti_0029.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"30",
|
|
"code":"36"
|
|
},
|
|
{
|
|
"desc":"Figure 1 and Table 1 show the process from receiving SQL statements to the statement execution by the SQL engine. The texts in red are steps where database administrators",
|
|
"product_code":"opengauss",
|
|
"title":"Query Execution Process",
|
|
"uri":"opengauss_opti_0030.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"36",
|
|
"code":"37"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Introduction to the SQL Execution Plan",
|
|
"uri":"opengauss_opti_0031.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"36",
|
|
"code":"38"
|
|
},
|
|
{
|
|
"desc":"A SQL execution plan is a node tree, which displays detailed procedure when GaussDB runs a SQL statement. A database operator indicates one step.You can run the EXPLAIN c",
|
|
"product_code":"opengauss",
|
|
"title":"Overview",
|
|
"uri":"opengauss_opti_0032.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"38",
|
|
"code":"39"
|
|
},
|
|
{
|
|
"desc":"As described in Overview, EXPLAIN displays execution plans, but will not actually run SQL statements. EXPLAIN ANALYZE and EXPLAIN PERFORMANCE both will actually run SQL s",
|
|
"product_code":"opengauss",
|
|
"title":"Description",
|
|
"uri":"opengauss_opti_0033.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"38",
|
|
"code":"40"
|
|
},
|
|
{
|
|
"desc":"You can analyze and optimize slow SQL statements.",
|
|
"product_code":"opengauss",
|
|
"title":"Tuning Process",
|
|
"uri":"opengauss_opti_0034.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"36",
|
|
"code":"41"
|
|
},
|
|
{
|
|
"desc":"In a database, statistics indicate the source data of a plan generated by a planner. If no statistics are collected or the statistics are outdated, the execution plan may",
|
|
"product_code":"opengauss",
|
|
"title":"Updating Statistics",
|
|
"uri":"opengauss_opti_0035.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"36",
|
|
"code":"42"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Reviewing and Modifying a Table Definition",
|
|
"uri":"opengauss_opti_0036.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"36",
|
|
"code":"43"
|
|
},
|
|
{
|
|
"desc":"In a distributed framework, data is distributed on DNs. Data on one or more DNs is stored on a physical storage device. To properly define a table, you must:Evenly distri",
|
|
"product_code":"opengauss",
|
|
"title":"Reviewing and Modifying a Table Definition",
|
|
"uri":"opengauss_opti_0037.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"43",
|
|
"code":"44"
|
|
},
|
|
{
|
|
"desc":"During database design, some key factors about table design will greatly affect the subsequent query performance of the database. Table design affects data storage as wel",
|
|
"product_code":"opengauss",
|
|
"title":"Selecting a Storage Type",
|
|
"uri":"opengauss_opti_0038.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"43",
|
|
"code":"45"
|
|
},
|
|
{
|
|
"desc":"In a replication table, full data is stored on each DN in an instance. It is suitable for the tables containing a small volume of data. Full data in a table is stored on ",
|
|
"product_code":"opengauss",
|
|
"title":"Selecting a Distribution Table",
|
|
"uri":"opengauss_opti_0039.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"43",
|
|
"code":"46"
|
|
},
|
|
{
|
|
"desc":"Using the following principles to select a distribution key for a hash table:The values of the distribution column should be discrete so that data can be evenly distribut",
|
|
"product_code":"opengauss",
|
|
"title":"Selecting a Distribution Key",
|
|
"uri":"opengauss_opti_0040.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"43",
|
|
"code":"47"
|
|
},
|
|
{
|
|
"desc":"Partial cluster key is the column-store-based technology. It can minimize or maximize sparse indexes to quickly filter base tables. Partial cluster key can specify multip",
|
|
"product_code":"opengauss",
|
|
"title":"Using Partial Cluster Key",
|
|
"uri":"opengauss_opti_0041.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"43",
|
|
"code":"48"
|
|
},
|
|
{
|
|
"desc":"A partitioned table is a logical table that is divided into several physical partitions for storage based on a specific plan. Data is stored on the physical partitions, i",
|
|
"product_code":"opengauss",
|
|
"title":"Using Partitioned Tables",
|
|
"uri":"opengauss_opti_0042.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"43",
|
|
"code":"49"
|
|
},
|
|
{
|
|
"desc":"Use the following principles to obtain efficient data types:Selecting data types that facilitate data calculationGenerally, the calculation of integers (including common ",
|
|
"product_code":"opengauss",
|
|
"title":"Selecting a Data Type",
|
|
"uri":"opengauss_opti_0043.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"43",
|
|
"code":"50"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Typical SQL Tuning Advantages",
|
|
"uri":"opengauss_opti_0044.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"36",
|
|
"code":"51"
|
|
},
|
|
{
|
|
"desc":"Performance issues may occur when you query data or run the INSERT, DELETE, UPDATE, or CREATE TABLE AS statement. In this case, you can query the warning column in the GS",
|
|
"product_code":"opengauss",
|
|
"title":"SQL Self-Diagnosis",
|
|
"uri":"opengauss_opti_0045.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"51",
|
|
"code":"52"
|
|
},
|
|
{
|
|
"desc":"Currently, the GaussDB optimizer can use three methods to develop statement execution policies in the distributed framework: generating a statement pushdown plan, a distr",
|
|
"product_code":"opengauss",
|
|
"title":"Tuning Statement Pushdown",
|
|
"uri":"opengauss_opti_0046.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"51",
|
|
"code":"53"
|
|
},
|
|
{
|
|
"desc":"When an application runs a SQL statement to operate the database, a large number of subqueries are used because they are clearer than table join. Especially in complicate",
|
|
"product_code":"opengauss",
|
|
"title":"Tuning Subqueries",
|
|
"uri":"opengauss_opti_0047.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"51",
|
|
"code":"54"
|
|
},
|
|
{
|
|
"desc":"GaussDB generates optimal execution plans based on the cost estimation. Optimizers need to estimate the number of data rows and the cost based on statistics collected usi",
|
|
"product_code":"opengauss",
|
|
"title":"Tuning Statistics",
|
|
"uri":"opengauss_opti_0048.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"51",
|
|
"code":"55"
|
|
},
|
|
{
|
|
"desc":"A query statement needs to go through multiple operator procedures to generate the final result. Sometimes, the overall query performance deteriorates due to long executi",
|
|
"product_code":"opengauss",
|
|
"title":"Tuning Operators",
|
|
"uri":"opengauss_opti_0049.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"51",
|
|
"code":"56"
|
|
},
|
|
{
|
|
"desc":"Data skew breaks the balance among nodes in the distributed MPP architecture. If the amount of data stored or processed by a node is much greater than that by other nodes",
|
|
"product_code":"opengauss",
|
|
"title":"Tuning Data Skew",
|
|
"uri":"opengauss_opti_0050.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"51",
|
|
"code":"57"
|
|
},
|
|
{
|
|
"desc":"Based on the SQL execution mechanism and a large number of practices, SQL statements can be optimized by following certain rules to enable the database to execute SQL sta",
|
|
"product_code":"opengauss",
|
|
"title":"Experience in Rewriting SQL Statements",
|
|
"uri":"opengauss_opti_0051.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"36",
|
|
"code":"58"
|
|
},
|
|
{
|
|
"desc":"This section describes the key CN configuration parameters that affect the GaussDB SQL tuning performance.",
|
|
"product_code":"opengauss",
|
|
"title":"Resetting Key Parameters During SQL Tuning",
|
|
"uri":"opengauss_opti_0052.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"36",
|
|
"code":"59"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Hint-based Tuning",
|
|
"uri":"opengauss_opti_0053.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"36",
|
|
"code":"60"
|
|
},
|
|
{
|
|
"desc":"In plan hints, you can specify the following information to tune an execution plan, improving query performance.Join orderJoin, stream, and scan operationsNumber of rows ",
|
|
"product_code":"opengauss",
|
|
"title":"Plan Hint Tuning",
|
|
"uri":"opengauss_opti_0054.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"60",
|
|
"code":"61"
|
|
},
|
|
{
|
|
"desc":"Theses hints specify the join order and outer/inner tables.Specify only the join order.Specify both the join order and outer/inner tables. The outer/inner tables are spec",
|
|
"product_code":"opengauss",
|
|
"title":"Join Order Hints",
|
|
"uri":"opengauss_opti_0055.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"60",
|
|
"code":"62"
|
|
},
|
|
{
|
|
"desc":"These hints specify the join method, which can be Nested Loop, Hash Join, or Merge Join.no specifies that the specified hint will not be used for a join.table_list specif",
|
|
"product_code":"opengauss",
|
|
"title":"Join Operation Hints",
|
|
"uri":"opengauss_opti_0056.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"60",
|
|
"code":"63"
|
|
},
|
|
{
|
|
"desc":"These hints specify the number of rows in an intermediate result set. Both absolute values and relative values are supported.#, +, -, and * are operators used for hinting",
|
|
"product_code":"opengauss",
|
|
"title":"Rows Hints",
|
|
"uri":"opengauss_opti_0057.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"60",
|
|
"code":"64"
|
|
},
|
|
{
|
|
"desc":"These hints specify a stream operation, which can be broadcast or redistribute.no specifies that the specified hint will not be used for a stream operation.table_list ind",
|
|
"product_code":"opengauss",
|
|
"title":"Stream Operation Hints",
|
|
"uri":"opengauss_opti_0058.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"60",
|
|
"code":"65"
|
|
},
|
|
{
|
|
"desc":"These hints specify a scan operation, which can be tablescan, indexscan, or indexonlyscan.no specifies that the specified hint will not be used for a scan operation.table",
|
|
"product_code":"opengauss",
|
|
"title":"Scan Operation Hints",
|
|
"uri":"opengauss_opti_0059.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"60",
|
|
"code":"66"
|
|
},
|
|
{
|
|
"desc":"These hints specify the name of a sublink block.table specifies the name you have specified for a sublink block.The blockname hint is used by an outer query only when a s",
|
|
"product_code":"opengauss",
|
|
"title":"Sublink Name Hints",
|
|
"uri":"opengauss_opti_0060.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"60",
|
|
"code":"67"
|
|
},
|
|
{
|
|
"desc":"Theses hints specify redistribution keys containing skew data and skew values, and are used to optimize redistribution involving Join or HashAgg.Specify single-table skew",
|
|
"product_code":"opengauss",
|
|
"title":"Skew Hints",
|
|
"uri":"opengauss_opti_0061.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"60",
|
|
"code":"68"
|
|
},
|
|
{
|
|
"desc":"Plan hints change an execution plan. You can run EXPLAIN to view the changes.Hints containing errors are invalid and do not affect statement execution. The errors will be",
|
|
"product_code":"opengauss",
|
|
"title":"Hint Errors, Conflicts, and Other Warnings",
|
|
"uri":"opengauss_opti_0062.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"60",
|
|
"code":"69"
|
|
},
|
|
{
|
|
"desc":"This section takes the statements in TPC-DS (Q24) as an example to describe how to optimize an execution plan by using hints in 1000X+24DN environments. The following is ",
|
|
"product_code":"opengauss",
|
|
"title":"Plan Hint Cases",
|
|
"uri":"opengauss_opti_0063.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"60",
|
|
"code":"70"
|
|
},
|
|
{
|
|
"desc":"In some scenarios, implicit data type conversion may cause performance problems. For example:The execution plan of the preceding query is as follows:The data type of c1 i",
|
|
"product_code":"opengauss",
|
|
"title":"Checking the Implicit Conversion Performance",
|
|
"uri":"opengauss_opti_0064.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"36",
|
|
"code":"71"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Optimization Cases",
|
|
"uri":"opengauss_opti_0065.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"30",
|
|
"code":"72"
|
|
},
|
|
{
|
|
"desc":"Tables are defined as follows:The following query is executed:If a is the distribution key of t1 and t2:Then Streaming exists in the execution plan and the data volume is",
|
|
"product_code":"opengauss",
|
|
"title":"Case: Selecting an Appropriate Distribution Key",
|
|
"uri":"opengauss_opti_0066.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"72",
|
|
"code":"73"
|
|
},
|
|
{
|
|
"desc":"To query information about all employees, run the following statements:The original execution plan is as follows before creating the places.place_id and states.state_id i",
|
|
"product_code":"opengauss",
|
|
"title":"Case: Creating an Appropriate Index",
|
|
"uri":"opengauss_opti_0067.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"72",
|
|
"code":"74"
|
|
},
|
|
{
|
|
"desc":"Figure 1 shows the execution plan.As shown in Figure 1, the sequential scan phase is time consuming.The JOIN performance is poor because a large number of null values exi",
|
|
"product_code":"opengauss",
|
|
"title":"Case: Adding NOT NULL for JOIN Columns",
|
|
"uri":"opengauss_opti_0068.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"72",
|
|
"code":"75"
|
|
},
|
|
{
|
|
"desc":"In an execution plan, more than 95% of the execution time is spent on window agg performed on the CN. In this case, sum is performed for the two columns separately, and t",
|
|
"product_code":"opengauss",
|
|
"title":"Case: Pushing Down Sort Operations to DNs",
|
|
"uri":"opengauss_opti_0069.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"72",
|
|
"code":"76"
|
|
},
|
|
{
|
|
"desc":"If bit0 of cost_param is set to 1 (set cost_param=1), an improved mechanism is used for estimating the selectivity of non-equi-joins. This method is more accurate for est",
|
|
"product_code":"opengauss",
|
|
"title":"Case: Setting cost_param and Optimizing Query Performance",
|
|
"uri":"opengauss_opti_0070.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"72",
|
|
"code":"77"
|
|
},
|
|
{
|
|
"desc":"During a site test, the information is displayed after EXPLAIN ANALYZE is run:According to the execution information, Hash Join becomes the performance bottleneck of the ",
|
|
"product_code":"opengauss",
|
|
"title":"Case: Adjusting Distribution Keys",
|
|
"uri":"opengauss_opti_0071.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"72",
|
|
"code":"78"
|
|
},
|
|
{
|
|
"desc":"In the following simple SQL statements, the performance bottlenecks exist in the scan operation on the dwcjk table.Obviously, there are date features in the cjrq field of",
|
|
"product_code":"opengauss",
|
|
"title":"Case: Reconstructing Partitioned Tables",
|
|
"uri":"opengauss_opti_0072.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"72",
|
|
"code":"79"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Permissions Management",
|
|
"uri":"opengauss_07_0000.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"80"
|
|
},
|
|
{
|
|
"desc":"This section describes how to use Identity and Access Management (IAM) for fine-grained permissions management for your GaussDB resources. With IAM, you can:Create IAM us",
|
|
"product_code":"opengauss",
|
|
"title":"Creating a User and Granting Permissions",
|
|
"uri":"opengauss_07_0002.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"80",
|
|
"code":"81"
|
|
},
|
|
{
|
|
"desc":"Custom policies can be created to supplement the system-defined policies of GaussDB. For the actions supported for custom policies, see the section \"Permissions Policies ",
|
|
"product_code":"opengauss",
|
|
"title":"Creating a Custom Policy",
|
|
"uri":"opengauss_07_0003.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"80",
|
|
"code":"82"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Instance Management",
|
|
"uri":"opengauss_01_0032.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"83"
|
|
},
|
|
{
|
|
"desc":"You can change the name of an instance.You cannot perform the following operations when the instance name is being changed:Binding an EIPDeleting the instanceCreating a b",
|
|
"product_code":"opengauss",
|
|
"title":"Changing an Instance Name",
|
|
"uri":"opengauss_01_0033.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"84"
|
|
},
|
|
{
|
|
"desc":"You can reboot a DB instance for the modifications to take effect.You can reboot a DB instance only when its status is Available. Your database may be unavailable in some",
|
|
"product_code":"opengauss",
|
|
"title":"Rebooting a DB Instance",
|
|
"uri":"opengauss_01_0034.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"85"
|
|
},
|
|
{
|
|
"desc":"You need to delete unnecessary DB instances.You need to delete the DB instance that fails to be created.Deleted DB instances cannot be recovered. Exercise caution when pe",
|
|
"product_code":"opengauss",
|
|
"title":"Deleting a DB Instance",
|
|
"uri":"opengauss_01_0035.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"86"
|
|
},
|
|
{
|
|
"desc":"If you forget the password of your root account when using GaussDB, you can reset the password.If the password you provide is regarded as a weak password by the system, y",
|
|
"product_code":"opengauss",
|
|
"title":"Resetting the Administrator Password",
|
|
"uri":"opengauss_01_0036.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"87"
|
|
},
|
|
{
|
|
"desc":"You can bind an EIP to a GaussDB instance for public access and can unbind the EIP from an instance as required.To ensure that the database is accessible, the security gr",
|
|
"product_code":"opengauss",
|
|
"title":"Binding and Unbinding an EIP",
|
|
"uri":"opengauss_01_0037.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"88"
|
|
},
|
|
{
|
|
"desc":"As the instance deployment time and data increase, the database performance and storage will gradually reach the bottleneck. Adding nodes can improve the instance perform",
|
|
"product_code":"opengauss",
|
|
"title":"Adding Nodes",
|
|
"uri":"opengauss_01_0039.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"89"
|
|
},
|
|
{
|
|
"desc":"As service demand decreases, some CNs are left idle. To improve resource utilization, you can delete unnecessary coordinator nodes of your GaussDB instances.Deleting CNs ",
|
|
"product_code":"opengauss",
|
|
"title":"Deleting CNs",
|
|
"uri":"opengauss_01_0128.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"90"
|
|
},
|
|
{
|
|
"desc":"As more data is added, your GaussDB instance may start to run out of space. If the kernel system detects that the disk usage exceeds 85%, the instance is set to read-only",
|
|
"product_code":"opengauss",
|
|
"title":"Scaling Up Storage Space",
|
|
"uri":"opengauss_01_0041.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"91"
|
|
},
|
|
{
|
|
"desc":"You can view and modify the parameter values of a GaussDB instance.",
|
|
"product_code":"opengauss",
|
|
"title":"Modifying Instance Parameters",
|
|
"uri":"opengauss_01_0042.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"92"
|
|
},
|
|
{
|
|
"desc":"You can change the CPU and memory specifications of a GaussDB instance if needed.By default, the specifications cannot be reduced. If you need to reduce the specification",
|
|
"product_code":"opengauss",
|
|
"title":"Changing CPU and Memory Specifications",
|
|
"uri":"opengauss_01_scale.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"93"
|
|
},
|
|
{
|
|
"desc":"You can export instances in the list for review and analysis.A tenant can export a maximum of 3,000 instances at a time. The time required for the export depends on the n",
|
|
"product_code":"opengauss",
|
|
"title":"Exporting Instance Information",
|
|
"uri":"opengauss_01_0044.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"94"
|
|
},
|
|
{
|
|
"desc":"GaussDB provides failover priority on availability or reliability. You can change the failover priority of a DB instance on the Basic Information page.Reliability: Data c",
|
|
"product_code":"opengauss",
|
|
"title":"Changing Failover Priority",
|
|
"uri":"opengauss_01_0045.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"95"
|
|
},
|
|
{
|
|
"desc":"A security group is a collection of access control rules for ECSs and GaussDB instances that are within the same VPC, have the same security requirements, and are mutuall",
|
|
"product_code":"opengauss",
|
|
"title":"Configuring Security Group Rules",
|
|
"uri":"opengauss_security_group.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"83",
|
|
"code":"96"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Parameter Template Management",
|
|
"uri":"opengauss_01_0046.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"97"
|
|
},
|
|
{
|
|
"desc":"You can use parameters in a parameter template to manage DB engine configurations. A parameter template can be applied to one or more instances.If you create a DB instanc",
|
|
"product_code":"opengauss",
|
|
"title":"Creating a Parameter Template",
|
|
"uri":"opengauss_01_0047.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"98"
|
|
},
|
|
{
|
|
"desc":"You can modify parameters in a custom parameter template to bring out the best performance of the service.You can change parameter values in custom parameter templates on",
|
|
"product_code":"opengauss",
|
|
"title":"Modifying Parameters in a Parameter Template",
|
|
"uri":"opengauss_01_0048.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"99"
|
|
},
|
|
{
|
|
"desc":"You can export the parameter template information (parameter names, values, and descriptions) of a DB instance to a CSV file for analysis.Exporting to a file: You can exp",
|
|
"product_code":"opengauss",
|
|
"title":"Exporting Parameters",
|
|
"uri":"opengauss_01_0049.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"100"
|
|
},
|
|
{
|
|
"desc":"You can compare instance parameters with a parameter template to see the differences of parameter settings.You can compare default parameter templates with other paramete",
|
|
"product_code":"opengauss",
|
|
"title":"Comparing Parameter Templates",
|
|
"uri":"opengauss_01_0050.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"101"
|
|
},
|
|
{
|
|
"desc":"You can view the change history of DB instance parameters or custom parameter templates.In a newly replicated or created parameter template, the change history is blank.T",
|
|
"product_code":"opengauss",
|
|
"title":"Viewing Parameter Change History",
|
|
"uri":"opengauss_01_0051.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"102"
|
|
},
|
|
{
|
|
"desc":"You can replicate a parameter template you have created. When you have already created a parameter template and want to include most of the custom parameters and values f",
|
|
"product_code":"opengauss",
|
|
"title":"Replicating a Parameter Template",
|
|
"uri":"opengauss_01_0052.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"103"
|
|
},
|
|
{
|
|
"desc":"You can reset all parameters in a custom parameter template to their default settings.",
|
|
"product_code":"opengauss",
|
|
"title":"Resetting a Parameter Template",
|
|
"uri":"opengauss_01_0053.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"104"
|
|
},
|
|
{
|
|
"desc":"Changes to parameters in a custom parameter template take effect for DB instances only after you apply this parameter template to target DB instances. A parameter templat",
|
|
"product_code":"opengauss",
|
|
"title":"Applying a Parameter Template",
|
|
"uri":"opengauss_01_0054.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"105"
|
|
},
|
|
{
|
|
"desc":"You can view the application records of a parameter template.",
|
|
"product_code":"opengauss",
|
|
"title":"Viewing Application Records of a Parameter Template",
|
|
"uri":"opengauss_01_0055.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"106"
|
|
},
|
|
{
|
|
"desc":"You can modify the description of a parameter template you have created.You cannot modify the description of a default parameter template.After you submit the modificatio",
|
|
"product_code":"opengauss",
|
|
"title":"Modifying a Parameter Template Description",
|
|
"uri":"opengauss_01_0056.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"107"
|
|
},
|
|
{
|
|
"desc":"You can create up to 100 parameter templates and delete parameter templates that are no longer used.Deleted parameter templates cannot be recovered. Exercise caution when",
|
|
"product_code":"opengauss",
|
|
"title":"Deleting a Parameter Template",
|
|
"uri":"opengauss_01_0057.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"97",
|
|
"code":"108"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Data Backup",
|
|
"uri":"opengauss_01_0062.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"109"
|
|
},
|
|
{
|
|
"desc":"You can back up your GaussDB instances to ensure data reliability. Currently, backups are stored in an unencrypted form.Although GaussDB supports high availability, if a ",
|
|
"product_code":"opengauss",
|
|
"title":"Working with Backups",
|
|
"uri":"opengauss_01_0063.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"109",
|
|
"code":"110"
|
|
},
|
|
{
|
|
"desc":"When you create a GaussDB instance, an instance-level automated backup policy is enabled by default. After your instance is created, you can modify the automated backup p",
|
|
"product_code":"opengauss",
|
|
"title":"Configuring an Automated Backup Policy for Instances",
|
|
"uri":"opengauss_01_0064.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"109",
|
|
"code":"111"
|
|
},
|
|
{
|
|
"desc":"GaussDB allows you to create instance-level manual backups for available instances. You can use these backups to restore data.Manual backups are user-initiated full backu",
|
|
"product_code":"opengauss",
|
|
"title":"Creating a Manual Backup for Instances",
|
|
"uri":"opengauss_01_0065.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"109",
|
|
"code":"112"
|
|
},
|
|
{
|
|
"desc":"You can export backup information of instances to a CSV file for further analysis. The exported information includes the backup ID, backup name, instance name, instance I",
|
|
"product_code":"opengauss",
|
|
"title":"Exporting Backup Information",
|
|
"uri":"opengauss_01_0067.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"109",
|
|
"code":"113"
|
|
},
|
|
{
|
|
"desc":"You can delete manual backups for instances and tables to release storage space.Deleted manual backups cannot be recovered. Exercise caution when performing this operatio",
|
|
"product_code":"opengauss",
|
|
"title":"Deleting a Manual Backup",
|
|
"uri":"opengauss_01_0069.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"109",
|
|
"code":"114"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Data Restoration",
|
|
"uri":"opengauss_recover.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"115"
|
|
},
|
|
{
|
|
"desc":"You can use an instance-level automated or manual backup to restore data to the point in time when the backup was created. The restoration is at the DB instance level.Dat",
|
|
"product_code":"opengauss",
|
|
"title":"Restoring a Backup File to a DB Instance",
|
|
"uri":"opengauss_01_0068.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"115",
|
|
"code":"116"
|
|
},
|
|
{
|
|
"desc":"You can use an instance-level automated backup to restore a GaussDB instance to a specified point in time.You can restore data to a new instance.Only instances of version",
|
|
"product_code":"opengauss",
|
|
"title":"Restoring a DB Instance to a Specific Point in Time",
|
|
"uri":"opengauss_01_0066.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"115",
|
|
"code":"117"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Monitoring and Alarming",
|
|
"uri":"opengauss_01_0070.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"118"
|
|
},
|
|
{
|
|
"desc":"This section describes metrics reported by GaussDB as well as their namespaces and dimensions.SYS.GAUSSDBV5The following lists the performance metrics of GaussDB.",
|
|
"product_code":"opengauss",
|
|
"title":"Monitoring Metrics",
|
|
"uri":"opengauss_01_0071.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"118",
|
|
"code":"119"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Supported Events",
|
|
"uri":"opengauss_events.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"118",
|
|
"code":"120"
|
|
},
|
|
{
|
|
"desc":"You can set alarm rules to customize the monitored objects and notification policies and to stay aware of the operating status.The alarm rules include alarm rule names, r",
|
|
"product_code":"opengauss",
|
|
"title":"Creating Alarm Rules",
|
|
"uri":"opengauss_01_0072.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"118",
|
|
"code":"121"
|
|
},
|
|
{
|
|
"desc":"Cloud Eye monitors operating statuses of DB instances. You can view the DB instance monitoring metrics on the management console. For details, see Viewing Metrics of DB I",
|
|
"product_code":"opengauss",
|
|
"title":"Viewing Monitoring Metrics",
|
|
"uri":"opengauss_01_0073.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"118",
|
|
"code":"122"
|
|
},
|
|
{
|
|
"desc":"You can create alarm rules for event monitoring.Specify Name and Description.Click next to the Alarm Notification field to enable alarm notification. The notification wi",
|
|
"product_code":"opengauss",
|
|
"title":"Creating an Alarm Rule to Monitor an Event",
|
|
"uri":"opengauss_create_event.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"118",
|
|
"code":"123"
|
|
},
|
|
{
|
|
"desc":"Event monitoring provides event data reporting, query, and alarm reporting. You can create alarm rules for both system and custom events. When specific events occur, Clou",
|
|
"product_code":"opengauss",
|
|
"title":"Introduction to Event Monitoring",
|
|
"uri":"opengauss_event_monitor.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"118",
|
|
"code":"124"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Interconnection with CTS",
|
|
"uri":"opengauss_08_0020.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"125"
|
|
},
|
|
{
|
|
"desc":"Cloud Trace Service (CTS) records operations associated with GaussDB for later query, audit, and backtrack.",
|
|
"product_code":"opengauss",
|
|
"title":"Key Operations Supported by CTS",
|
|
"uri":"opengauss_06_0004.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"125",
|
|
"code":"126"
|
|
},
|
|
{
|
|
"desc":"After CTS is enabled, operations on cloud resources are recorded. You can view the operation records of the last 7 days on the CTS console.This section describes how to v",
|
|
"product_code":"opengauss",
|
|
"title":"Viewing Traces",
|
|
"uri":"opengauss_06_0005.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"125",
|
|
"code":"127"
|
|
},
|
|
{
|
|
"desc":"The GaussDB management console provides quota management for enterprise projects of tenants.Quota management is available only for enterprise accounts configured in the w",
|
|
"product_code":"opengauss",
|
|
"title":"Quota Management",
|
|
"uri":"opengauss_01_0074.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"128"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Task Center",
|
|
"uri":"opengauss_01_0075.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"129"
|
|
},
|
|
{
|
|
"desc":"You can view the progresses and results of tasks on the Task Center page.You can view and manage the following tasks:Creating a DB instanceCreating a manual backupRestori",
|
|
"product_code":"opengauss",
|
|
"title":"Viewing a Task",
|
|
"uri":"opengauss_01_0076.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"129",
|
|
"code":"130"
|
|
},
|
|
{
|
|
"desc":"You can delete the task records that no longer need to be displayed. The deletion only deletes the task records, and does not delete the DB instances or terminate the tas",
|
|
"product_code":"opengauss",
|
|
"title":"Deleting a Task Record",
|
|
"uri":"opengauss_01_0077.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"129",
|
|
"code":"131"
|
|
},
|
|
{
|
|
"desc":"Tag Management Service (TMS) enables you to use tags on the management console to manage resources. TMS works with other cloud services to manage tags. TMS manages tags g",
|
|
"product_code":"opengauss",
|
|
"title":"Tags",
|
|
"uri":"opengauss_tag.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"132"
|
|
},
|
|
{
|
|
"desc":"You can rebuild a deleted DB instance from the recycle bin.The recycle bin is enabled by default and cannot be disabled. The retention period is 7 days by default.You can",
|
|
"product_code":"opengauss",
|
|
"title":"Rebuilding a Deleted Instance",
|
|
"uri":"opengauss_recycle.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"133"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Usage Guidelines and Suggestions",
|
|
"uri":"opengauss_tips.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"29",
|
|
"code":"134"
|
|
},
|
|
{
|
|
"desc":"This section describes the database-related design and development specifications in the product design and development process based on the product lifecycle.It aims to ",
|
|
"product_code":"opengauss",
|
|
"title":"Overview",
|
|
"uri":"opengauss_tips_0001.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"134",
|
|
"code":"135"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Database Design Guidelines",
|
|
"uri":"opengauss_tips_0002.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"134",
|
|
"code":"136"
|
|
},
|
|
{
|
|
"desc":"Features that are not listed include but are not limited to user-defined and UUID data types, and trigger features. If you want to use them, contact GaussDB database tech",
|
|
"product_code":"opengauss",
|
|
"title":"General Guidelines",
|
|
"uri":"opengauss_tips_0006.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"136",
|
|
"code":"137"
|
|
},
|
|
{
|
|
"desc":"Based on Table 1, you need to ensure that the resource usage is between 40% and 70%. If the resource usage is lower than 40%, capacity reduction is recommended. If the re",
|
|
"product_code":"opengauss",
|
|
"title":"Deployment Guidelines",
|
|
"uri":"opengauss_tips_0007.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"136",
|
|
"code":"138"
|
|
},
|
|
{
|
|
"desc":"The name of a database object must contain up to 63 characters, start with a letter or underscore (_), and can contain letters, digits, underscores (_), dollar signs ($),",
|
|
"product_code":"opengauss",
|
|
"title":"Database Object Naming Guidelines",
|
|
"uri":"opengauss_tips_0008.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"136",
|
|
"code":"139"
|
|
},
|
|
{
|
|
"desc":"The database name must be specified when the JDBC client is used to connect to the database. The format is as follows:jdbc:postgresql://host:port/database?param1=value1&p",
|
|
"product_code":"opengauss",
|
|
"title":"Database Design Guidelines",
|
|
"uri":"opengauss_tips_0009.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"136",
|
|
"code":"140"
|
|
},
|
|
{
|
|
"desc":"Before using a service, the root user must create DATABASE, SCHEMA, and USER for the service, and then grant object permissions to related users.If a user is not the sche",
|
|
"product_code":"opengauss",
|
|
"title":"Permission Design Guidelines",
|
|
"uri":"opengauss_tips_0010.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"136",
|
|
"code":"141"
|
|
},
|
|
{
|
|
"desc":"You must specify table distribution (DISTRIBUTE BY). The principles for selecting a table distribution policy are as follows:Two table distribution policies are provided:",
|
|
"product_code":"opengauss",
|
|
"title":"Table Design Guidelines",
|
|
"uri":"opengauss_tips_0011.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"136",
|
|
"code":"142"
|
|
},
|
|
{
|
|
"desc":"Use recommended data types for column design.Recommended data types must be used for column design. If you want to use prohibited or not recommended data types, contact t",
|
|
"product_code":"opengauss",
|
|
"title":"Column Design Guidelines",
|
|
"uri":"opengauss_tips_0012.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"136",
|
|
"code":"143"
|
|
},
|
|
{
|
|
"desc":"Use the recommended index type in database index practice.Recommended types must be used for index design. If you need to use prohibited, not recommended, or restricted i",
|
|
"product_code":"opengauss",
|
|
"title":"Index Design Guidelines",
|
|
"uri":"opengauss_tips_0013.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"136",
|
|
"code":"144"
|
|
},
|
|
{
|
|
"desc":"Do not use stored procedures or triggers to implement service logic. Instead, process the logic on the service server to prevent logical dependency on the database.Do not",
|
|
"product_code":"opengauss",
|
|
"title":"Function/Stored Procedure Design Guidelines",
|
|
"uri":"opengauss_tips_0014.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"136",
|
|
"code":"145"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Database Programming Guidelines",
|
|
"uri":"opengauss_tips_0003.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"134",
|
|
"code":"146"
|
|
},
|
|
{
|
|
"desc":"Clients (such as JDBC) should use default (global) parameters for queries and cannot use session-level GUC parameters.When you change GUC parameters through ODBC or JDBC,",
|
|
"product_code":"opengauss",
|
|
"title":"GUC Parameter Programming Guidelines",
|
|
"uri":"opengauss_tips_0015.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"146",
|
|
"code":"147"
|
|
},
|
|
{
|
|
"desc":"You need to use schemaname.tablename to access objects (tables and functions).If the schema name prefix is not added, the system searches all tablespaces in the current s",
|
|
"product_code":"opengauss",
|
|
"title":"Object Access Programming Guidelines",
|
|
"uri":"opengauss_tips_0016.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"146",
|
|
"code":"148"
|
|
},
|
|
{
|
|
"desc":"During table query, the WHERE condition must contain all partitioning keys. Otherwise, the query will be performed on multiple nodes, affecting the system concurrency and",
|
|
"product_code":"opengauss",
|
|
"title":"WHERE",
|
|
"uri":"opengauss_tips_0017.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"146",
|
|
"code":"149"
|
|
},
|
|
{
|
|
"desc":"Do not use the wildcard character (*) in the SELECT statement.If the table structure is changed due to service or database upgrade when a wildcard character is used to qu",
|
|
"product_code":"opengauss",
|
|
"title":"SELECT",
|
|
"uri":"opengauss_tips_0018.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"146",
|
|
"code":"150"
|
|
},
|
|
{
|
|
"desc":"INSERT ON DUPLICATE KEY UPDATE does not support UPDATE on columns with primary keys or unique constraints.The semantics of INSERT ON DUPLICATE KEY UPDATE is to update the",
|
|
"product_code":"opengauss",
|
|
"title":"INSERT",
|
|
"uri":"opengauss_tips_0019.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"146",
|
|
"code":"151"
|
|
},
|
|
{
|
|
"desc":"LIMIT cannot be directly used in the UPDATE statement. The WHERE condition must be used to specify the target row to be updated.In GTM-free mode, cross-node transactions ",
|
|
"product_code":"opengauss",
|
|
"title":"UPDATE",
|
|
"uri":"opengauss_tips_0020.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"146",
|
|
"code":"152"
|
|
},
|
|
{
|
|
"desc":"LIMIT cannot be used in the DELETE statement. The WHERE condition should be used to specify the target row to be deleted.In GMT-free mode, cross-node transactions are not",
|
|
"product_code":"opengauss",
|
|
"title":"DELETE",
|
|
"uri":"opengauss_tips_0021.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"146",
|
|
"code":"153"
|
|
},
|
|
{
|
|
"desc":"The nesting depth of multi-table association must be less than 8.If the association nesting is too deep, slow SQL statements may be generated. You need to optimize the as",
|
|
"product_code":"opengauss",
|
|
"title":"Join Query",
|
|
"uri":"opengauss_tips_0022.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"146",
|
|
"code":"154"
|
|
},
|
|
{
|
|
"desc":"Duplicate subquery statements are not allowed in an SQL statement.Do not use scalar queries.A scalar subquery is a subquery whose result is one value and whose condition ",
|
|
"product_code":"opengauss",
|
|
"title":"Subqueries",
|
|
"uri":"opengauss_tips_0023.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"146",
|
|
"code":"155"
|
|
},
|
|
{
|
|
"desc":"In GTM-free mode, cross-node transactions are not allowed.In GTM-free mode, if the executed SQL statement contains cross-node transactions, an error is reported.If the st",
|
|
"product_code":"opengauss",
|
|
"title":"Transactions",
|
|
"uri":"opengauss_tips_0024.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"146",
|
|
"code":"156"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Client Programming Guidelines",
|
|
"uri":"opengauss_tips_0004.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"134",
|
|
"code":"157"
|
|
},
|
|
{
|
|
"desc":"A database must be specified for the JDBC instance. Once the instance is created, the database cannot be changed.The length of a single SQL statement cannot exceed 2 GB. ",
|
|
"product_code":"opengauss",
|
|
"title":"JDBC",
|
|
"uri":"opengauss_tips_0025.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"157",
|
|
"code":"158"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Parameter Configuration Guidelines",
|
|
"uri":"opengauss_tips_0005.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"134",
|
|
"code":"159"
|
|
},
|
|
{
|
|
"desc":"A database provides many operation parameters. Configurations of these parameters affect the behavior of the database system. Before changing these parameters, learn the ",
|
|
"product_code":"opengauss",
|
|
"title":"GaussDB Parameter Configuration Standards",
|
|
"uri":"opengauss_tips_0026.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"159",
|
|
"code":"160"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"FAQs",
|
|
"uri":"opengauss_01_0081.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"",
|
|
"code":"161"
|
|
},
|
|
{
|
|
"desc":"No. The storage of GaussDB instances cannot be scaled down.",
|
|
"product_code":"opengauss",
|
|
"title":"Can I Scale Down the Storage Space of My GaussDB Instances?",
|
|
"uri":"opengauss_faq_0001.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"161",
|
|
"code":"162"
|
|
},
|
|
{
|
|
"desc":"Yes, GaussDB is compatible with SSL. For details, see SSL Connection.",
|
|
"product_code":"opengauss",
|
|
"title":"Can I Connect to GaussDB over SSL?",
|
|
"uri":"opengauss_01_0083.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"161",
|
|
"code":"163"
|
|
},
|
|
{
|
|
"desc":"Sorry, you cannot grant SUPER permission to any users.If a stored procedure fails to be imported, check whether there are some statements requiring SUPER permissions in t",
|
|
"product_code":"opengauss",
|
|
"title":"How Do I Grant SUPER Permission to a User?",
|
|
"uri":"opengauss_01_0085.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"161",
|
|
"code":"164"
|
|
},
|
|
{
|
|
"desc":"No. Currently, GaussDB supports hot backup only.",
|
|
"product_code":"opengauss",
|
|
"title":"Does GaussDB Support Both Cold Backup and Hot Backup?",
|
|
"uri":"opengauss_01_0086.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"161",
|
|
"code":"165"
|
|
},
|
|
{
|
|
"desc":"Press Win+R to open the Run dialog box, enter MMC, and press Enter.On the displayed console, choose File > Add/Remove Snap-in.In the Available snap-ins pane to the left o",
|
|
"product_code":"opengauss",
|
|
"title":"How Can I Import the Root Certificate to a Windows or Linux Server?",
|
|
"uri":"opengauss_01_0088.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"161",
|
|
"code":"166"
|
|
},
|
|
{
|
|
"desc":"To ensure database security, change the parameter values to the default values after the password is reset.",
|
|
"product_code":"opengauss",
|
|
"title":"What Do I Do If a Database Instance Is Locked?",
|
|
"uri":"opengauss_faq_0002.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"161",
|
|
"code":"167"
|
|
},
|
|
{
|
|
"desc":"When workloads on a DB instance are heavy, the replay speed of standby nodes cannot catch up with write speed of primary nodes. After the system runs for a long time, log",
|
|
"product_code":"opengauss",
|
|
"title":"What Do I Do If Replay Speed of Standby Nodes Cannot Catch Up with Write Speed of Primary Nodes?",
|
|
"uri":"opengauss_faq_0010.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"161",
|
|
"code":"168"
|
|
},
|
|
{
|
|
"desc":"Based on the Postgres-XC architecture of open-source PostgreSQL 9.2, the earliest GaussDB kernel developed a multi-CN architecture, on which some major features, such as ",
|
|
"product_code":"opengauss",
|
|
"title":"What is the Relationship Between GaussDB and PostgreSQL?",
|
|
"uri":"opengauss_faq_0012.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"161",
|
|
"code":"169"
|
|
},
|
|
{
|
|
"desc":"HUAWEI CLOUD Help Center presents technical documents to help you quickly get started with HUAWEI CLOUD services. The technical documents include Service Overview, Price Details, Purchase Guide, User Guide, API Reference, Best Practices, FAQs, and Videos.",
|
|
"product_code":"opengauss",
|
|
"title":"Change History",
|
|
"uri":"opengauss_01_0089.html",
|
|
"doc_type":"usermanual",
|
|
"p_code":"",
|
|
"code":"170"
|
|
}
|
|
] |