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doc-exports/docs/drs/umn/drs_04_0030.html
wangdengke2 0110b557aa drs_umn 
Reviewed-by: Székely, Ond <ond.szekely@t-systems.com>
Co-authored-by: wangdengke2 <wangdengke2@huawei.com>
Co-committed-by: wangdengke2 <wangdengke2@huawei.com>
2025-08-14 14:05:39 +00:00

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<a name="drs_04_0030"></a><a name="drs_04_0030"></a>
<h1 class="topictitle1">What Are the Precautions for Migrating Data from an Earlier Version MySQL to MySQL 8.0?</h1>
<div id="body8662426"><p id="drs_04_0030__en-us_topic_0000001160149294_p895925617559">Based on MySQL 5.7, some new features have been added to MySQL 8.0. There are performance differences between the two versions. Before migration, you need to analyze compatibility and provide a corresponding solution. The following shows the analysis:</p>
<ul id="drs_04_0030__en-us_topic_0000001160149294_ul11449118175611"><li id="drs_04_0030__en-us_topic_0000001160149294_li7449201835616">Compatibility analysis<p id="drs_04_0030__en-us_topic_0000001160149294_p7604140144414"><a name="drs_04_0030__en-us_topic_0000001160149294_li7449201835616"></a><a name="en-us_topic_0000001160149294_li7449201835616"></a>MySQL 8.0 and MySQL 5.7 Community Edition are analyzed as follows:</p>
<ol id="drs_04_0030__en-us_topic_0000001160149294_ol116998011579"><li id="drs_04_0030__en-us_topic_0000001160149294_li96992002578">Compatibility does not affect migration, but the solutions are different.
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_04_0030__en-us_topic_0000001160149294_table772141625111" frame="border" border="1" rules="all"><thead align="left"><tr id="drs_04_0030__en-us_topic_0000001160149294_row4995131612517"><th align="left" class="cellrowborder" valign="top" width="13.120000000000001%" id="mcps1.3.2.1.2.1.1.1.6.1.1"><p id="drs_04_0030__en-us_topic_0000001160149294_p129952016145113">Compatibility</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="28.110000000000003%" id="mcps1.3.2.1.2.1.1.1.6.1.2"><p id="drs_04_0030__en-us_topic_0000001160149294_p1899513161516">Check Item</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="10.71%" id="mcps1.3.2.1.2.1.1.1.6.1.3"><p id="drs_04_0030__en-us_topic_0000001160149294_p13995141625118">Function</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="7.920000000000001%" id="mcps1.3.2.1.2.1.1.1.6.1.4"><p id="drs_04_0030__en-us_topic_0000001160149294_p39950163517">Status</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="40.14%" id="mcps1.3.2.1.2.1.1.1.6.1.5"><p id="drs_04_0030__en-us_topic_0000001160149294_p1999551612514">Solution</p>
</th>
</tr>
</thead>
<tbody><tr id="drs_04_0030__en-us_topic_0000001160149294_row49962016205112"><td class="cellrowborder" rowspan="8" valign="top" width="13.120000000000001%" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p599691655116">Data types or functions</p>
</td>
<td class="cellrowborder" valign="top" width="28.110000000000003%" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p10996191613519">ENCODE()</p>
</td>
<td class="cellrowborder" valign="top" width="10.71%" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p19996141620517">Encryption</p>
</td>
<td class="cellrowborder" valign="top" width="7.920000000000001%" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1999651665111">Deleted</p>
</td>
<td class="cellrowborder" valign="top" width="40.14%" headers="mcps1.3.2.1.2.1.1.1.6.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p17996111613513">Replaced by AES_ENCRYPT()</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row18996101611518"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p79961716115116">DECODE()</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p12996151655117">Decryption</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p139961616115119">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1699601617516">Replaced by AES_DECRYPT()</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row499671655110"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1999641610511">ENCRYPT()</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p20996171617511">Encryption</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1299611611511">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p189962016205118">Replaced by SHA2()</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row0996216105114"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p17996111617519">DES_ENCRYPT()</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1199619167514">Encryption</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p159971216135117">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p899710168517">Replaced by AES_ENCRYPT()</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row199718164518"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p129978169516">DES_DECRYPT()</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p699721665113">Decryption</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p299710169514">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p9997151611513">Replaced by AES_DECRYPT()</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row1899741611517"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p799781605112">JSON_APPEND()</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p79978161519">Adds JSON elements.</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p199710168516">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p14997101635114">Replaced by JSON_ARRAY_APPEND()</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row299871665117"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1299861655116">PASSWORD()</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p11998151615119">Changes a user password.</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1399891610514">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p79989166515">ALTER USER user IDENTIFIED BY 'auth_string';</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row4998201613519"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p3998161665114">JSON_MERGE()</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p399801625112">Merges multiple JSONs.</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p0998816205117">Discarded</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p20998101619511">Replaced by JSON_MERGE_PERSERVE()</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row12998416165114"><td class="cellrowborder" valign="top" width="13.120000000000001%" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p8998151615117">SQL MODE</p>
</td>
<td class="cellrowborder" valign="top" width="28.110000000000003%" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p159983160510">NO_AUTO_CREATE_USER, DB2, MAXDB, MSSQL, MYSQL323, MYSQL40, ORACLE, POSTGRESQL, NO_FIELD_OPTIONS, NO_KEY_OPTIONS, NO_TABLE_OPTIONS</p>
</td>
<td class="cellrowborder" valign="top" width="10.71%" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p14998201616514">-</p>
</td>
<td class="cellrowborder" valign="top" width="7.920000000000001%" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p7998416155111">Deleted</p>
</td>
<td class="cellrowborder" valign="top" width="40.14%" headers="mcps1.3.2.1.2.1.1.1.6.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1799851616518">-</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row9999181617514"><td class="cellrowborder" valign="top" width="13.120000000000001%" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1299921618515">Foreign key constraint length</p>
</td>
<td class="cellrowborder" valign="top" width="28.110000000000003%" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p5999131618515">The constraint name cannot be greater than 64 characters.</p>
</td>
<td class="cellrowborder" valign="top" width="10.71%" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p699913162518">-</p>
</td>
<td class="cellrowborder" valign="top" width="7.920000000000001%" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p199911615513">-</p>
</td>
<td class="cellrowborder" valign="top" width="40.14%" headers="mcps1.3.2.1.2.1.1.1.6.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1099911619516">SELECT TABLE_SCHEMA, TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME IN (SELECT LEFT(SUBSTR(ID,INSTR(ID,'/')+1), INSTR(SUBSTR(ID,INSTR(ID,'/')+1),'_ibfk_')-1) FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN WHERE LENGTH(SUBSTR(ID,INSTR(ID,'/')+1))&gt;64);</p>
<p id="drs_04_0030__en-us_topic_0000001160149294_p19999171665116">Use the ALTER TABLE statement to adjust the length.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row10999716125117"><td class="cellrowborder" rowspan="7" valign="top" width="13.120000000000001%" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p149996163514">Features</p>
</td>
<td class="cellrowborder" valign="top" width="28.110000000000003%" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p0999141611517">Use the GRANT statement to create users.</p>
</td>
<td class="cellrowborder" valign="top" width="10.71%" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1499971635116">-</p>
</td>
<td class="cellrowborder" valign="top" width="7.920000000000001%" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p17999316155112">Deleted</p>
</td>
<td class="cellrowborder" valign="top" width="40.14%" headers="mcps1.3.2.1.2.1.1.1.6.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1999911167516">CREATE USER</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row1999941615119"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p9999116125116">Use the GRANT statement to modify user information.</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p13999616125119">-</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p15999191625118">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p73801452201714">ALTER USER</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row999901610510"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p199991316155113">IDENTIFIED BY PASSWORD 'auth_string'</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p189991516165116">Sets new passwords</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p15999116195114">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p2999181625118">IDENTIFIED WITH auth_plugin AS 'auth_string'</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row89991716195110"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p40171705113">\N in a SQL statement</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p708171518">NULL</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p60817165115">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p10817105115">Replaced by NULL</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row50117155110"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p16091719512">PROCEDURE ANALYSE() syntax</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p14081716516">Specifies the recommended field type is provided after the MySQL field value is analyzed.</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p808174519">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1709176517">-</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row9081775112"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p170101725118">Spatial functions</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p602175513">-</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p20151711511">-</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1301717165112">-</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row0014176518"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p130317165118">mysql_install_db</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p140191711518">Initialization</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p9001715510">Deleted</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.1.1.1.6.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p8012177515">mysqld --initialize or --initialize-insecure</p>
</td>
</tr>
</tbody>
</table>
</div>
</li><li id="drs_04_0030__en-us_topic_0000001160149294_li1997320825710">The following items affect the migration. You need to check in advance.
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_04_0030__en-us_topic_0000001160149294_table2907846165118" frame="border" border="1" rules="all"><thead align="left"><tr id="drs_04_0030__en-us_topic_0000001160149294_row74134715516"><th align="left" class="cellrowborder" valign="top" width="10.73%" id="mcps1.3.2.1.2.2.1.1.7.1.1"><p id="drs_04_0030__en-us_topic_0000001160149294_p343470517"><strong id="drs_04_0030__en-us_topic_0000001160149294_b18732195314615">Compatibility</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="22.99%" id="mcps1.3.2.1.2.2.1.1.7.1.2"><p id="drs_04_0030__en-us_topic_0000001160149294_p11444725115"><strong id="drs_04_0030__en-us_topic_0000001160149294_b1489315541461">Check Item</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="8.75%" id="mcps1.3.2.1.2.2.1.1.7.1.3"><p id="drs_04_0030__en-us_topic_0000001160149294_p14247115118"><strong id="drs_04_0030__en-us_topic_0000001160149294_b8589358760">Function</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="6.49%" id="mcps1.3.2.1.2.2.1.1.7.1.4"><p id="drs_04_0030__en-us_topic_0000001160149294_p1351479518"><strong id="drs_04_0030__en-us_topic_0000001160149294_b108904593616">Status</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="32.83%" id="mcps1.3.2.1.2.2.1.1.7.1.5"><p id="drs_04_0030__en-us_topic_0000001160149294_p1551447155119"><strong id="drs_04_0030__en-us_topic_0000001160149294_b299740371">Solution</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="18.21%" id="mcps1.3.2.1.2.2.1.1.7.1.6"><p id="drs_04_0030__en-us_topic_0000001160149294_p135184715111"><strong id="drs_04_0030__en-us_topic_0000001160149294_b1116844113146">Original Usage</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="drs_04_0030__en-us_topic_0000001160149294_row652474519"><td class="cellrowborder" valign="top" width="10.73%" headers="mcps1.3.2.1.2.2.1.1.7.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p65104710519">Reserving keywords</p>
</td>
<td class="cellrowborder" valign="top" width="22.99%" headers="mcps1.3.2.1.2.2.1.1.7.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p85104718515">cume_dist, dense_rank, empty, except, first_value, grouping, groups, json_table, lag, last_value, lateral, lead, nth_value, ntile, of, over, percent_rank, rank, recursive,row_number, system, window</p>
</td>
<td class="cellrowborder" valign="top" width="8.75%" headers="mcps1.3.2.1.2.2.1.1.7.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p4594725113">-</p>
</td>
<td class="cellrowborder" valign="top" width="6.49%" headers="mcps1.3.2.1.2.2.1.1.7.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p6554717512">Added</p>
</td>
<td class="cellrowborder" valign="top" width="32.83%" headers="mcps1.3.2.1.2.2.1.1.7.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p45124725112">SET sql_mode = 'ANSI_QUOTES'</p>
</td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.2.1.2.2.1.1.7.1.6 "><p id="drs_04_0030__en-us_topic_0000001160149294_p105104715120">Name: database, table, index, column, alias, view, stored procedure, partition, and tablespace</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row14554716511"><td class="cellrowborder" valign="top" width="10.73%" headers="mcps1.3.2.1.2.2.1.1.7.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p19594713512">Character set</p>
</td>
<td class="cellrowborder" valign="top" width="22.99%" headers="mcps1.3.2.1.2.2.1.1.7.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p125114735115">UTF8MB3</p>
</td>
<td class="cellrowborder" valign="top" width="8.75%" headers="mcps1.3.2.1.2.2.1.1.7.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1551947205119">-</p>
</td>
<td class="cellrowborder" valign="top" width="6.49%" headers="mcps1.3.2.1.2.2.1.1.7.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p165134795118">Discarded</p>
</td>
<td class="cellrowborder" valign="top" width="32.83%" headers="mcps1.3.2.1.2.2.1.1.7.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p195144717511">Replaced by UTF8MB4.</p>
</td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.2.1.2.2.1.1.7.1.6 "><p id="drs_04_0030__en-us_topic_0000001160149294_p05114712516">-</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row155164719516"><td class="cellrowborder" valign="top" width="10.73%" headers="mcps1.3.2.1.2.2.1.1.7.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1657471518">Partition table name</p>
</td>
<td class="cellrowborder" valign="top" width="22.99%" headers="mcps1.3.2.1.2.2.1.1.7.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p2051547155117">Partition tables of storage engines that do not support local partitions are not allowed.</p>
</td>
<td class="cellrowborder" valign="top" width="8.75%" headers="mcps1.3.2.1.2.2.1.1.7.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p195174785120">-</p>
</td>
<td class="cellrowborder" valign="top" width="6.49%" headers="mcps1.3.2.1.2.2.1.1.7.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p18574710517">Deleted</p>
</td>
<td class="cellrowborder" valign="top" width="32.83%" headers="mcps1.3.2.1.2.2.1.1.7.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p35164719513">SELECT TABLE_SCHEMA, TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE ENGINE NOT IN ('innodb', 'ndbcluster') AND CREATE_OPTIONS LIKE '%partitioned%';</p>
<p id="drs_04_0030__en-us_topic_0000001160149294_p551347175111">You can use either of the following methods:</p>
<p id="drs_04_0030__en-us_topic_0000001160149294_p185447125117">(1) ALTER TABLE table_name ENGINE=INNODB;</p>
<p id="drs_04_0030__en-us_topic_0000001160149294_p195184712513">(2) ALTER TABLE table_name REMOVE PARTITIONING;</p>
</td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.2.1.2.2.1.1.7.1.6 "><p id="drs_04_0030__en-us_topic_0000001160149294_p35647195116">MyISAM is not supported.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row196747155120"><td class="cellrowborder" valign="top" width="10.73%" headers="mcps1.3.2.1.2.2.1.1.7.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p761747195116">Syntax</p>
</td>
<td class="cellrowborder" valign="top" width="22.99%" headers="mcps1.3.2.1.2.2.1.1.7.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1861947205112">group by... asc/desc</p>
</td>
<td class="cellrowborder" valign="top" width="8.75%" headers="mcps1.3.2.1.2.2.1.1.7.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p166347105116">Ascending/Descending</p>
</td>
<td class="cellrowborder" valign="top" width="6.49%" headers="mcps1.3.2.1.2.2.1.1.7.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p36174765120">Deleted</p>
</td>
<td class="cellrowborder" valign="top" width="32.83%" headers="mcps1.3.2.1.2.2.1.1.7.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p3654719510">Replaced by the ORDER By clause.</p>
</td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.2.1.2.2.1.1.7.1.6 "><p id="drs_04_0030__en-us_topic_0000001160149294_p16347195116">View and function</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row19620477519"><td class="cellrowborder" rowspan="2" valign="top" width="10.73%" headers="mcps1.3.2.1.2.2.1.1.7.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p16694795116">Name length</p>
</td>
<td class="cellrowborder" valign="top" width="22.99%" headers="mcps1.3.2.1.2.2.1.1.7.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p96174775118">The view name cannot be greater than 64 characters.</p>
</td>
<td class="cellrowborder" valign="top" width="8.75%" headers="mcps1.3.2.1.2.2.1.1.7.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p8634714511">-</p>
</td>
<td class="cellrowborder" valign="top" width="6.49%" headers="mcps1.3.2.1.2.2.1.1.7.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p11624710516">-</p>
</td>
<td class="cellrowborder" valign="top" width="32.83%" headers="mcps1.3.2.1.2.2.1.1.7.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p11624712511">ALTER</p>
</td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.2.1.2.2.1.1.7.1.6 "><p id="drs_04_0030__en-us_topic_0000001160149294_p11611475516">The value can contain a maximum of 255 characters.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row76144795113"><td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.2.1.1.7.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p46747115116">The enum or set element contains a maximum of 255 characters.</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.2.1.1.7.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p368473514">-</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.2.1.1.7.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p156194719517">-</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.2.1.1.7.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p0618471510">Handled by users.</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.1.2.2.1.1.7.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p106104755115">The value can contain a maximum of 64 KB.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row3674714517"><td class="cellrowborder" valign="top" width="10.73%" headers="mcps1.3.2.1.2.2.1.1.7.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p12694719511">Upper and lower case letters</p>
</td>
<td class="cellrowborder" valign="top" width="22.99%" headers="mcps1.3.2.1.2.2.1.1.7.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p4714725114">lower_case_table_names</p>
</td>
<td class="cellrowborder" valign="top" width="8.75%" headers="mcps1.3.2.1.2.2.1.1.7.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p67047185113">Specifies whether to set the MySQL table name case sensitive.</p>
</td>
<td class="cellrowborder" valign="top" width="6.49%" headers="mcps1.3.2.1.2.2.1.1.7.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p5704710517">-</p>
</td>
<td class="cellrowborder" valign="top" width="32.83%" headers="mcps1.3.2.1.2.2.1.1.7.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p171547175119">If this parameter is set to <strong id="drs_04_0030__en-us_topic_0000001160149294_b1275710213366">1</strong> during the upgrade, ensure that the schema and table names are in lowercase.</p>
<p id="drs_04_0030__en-us_topic_0000001160149294_p87174715119">SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME != LOWER(TABLE_NAME) AND TABLE_TYPE = 'BASE TABLE';</p>
<p id="drs_04_0030__en-us_topic_0000001160149294_p1571747115112">SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME != LOWER(SCHEMA_NAME);</p>
</td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.2.1.2.2.1.1.7.1.6 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1671347205111">-</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row197164718516"><td class="cellrowborder" valign="top" width="10.73%" headers="mcps1.3.2.1.2.2.1.1.7.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p2071447125110">Triggers</p>
</td>
<td class="cellrowborder" valign="top" width="22.99%" headers="mcps1.3.2.1.2.2.1.1.7.1.2 "><p id="drs_04_0030__en-us_topic_0000001160149294_p971547165119">Check whether there is an empty definition or invalid creation context.</p>
</td>
<td class="cellrowborder" valign="top" width="8.75%" headers="mcps1.3.2.1.2.2.1.1.7.1.3 "><p id="drs_04_0030__en-us_topic_0000001160149294_p14744715518">-</p>
</td>
<td class="cellrowborder" valign="top" width="6.49%" headers="mcps1.3.2.1.2.2.1.1.7.1.4 "><p id="drs_04_0030__en-us_topic_0000001160149294_p571147165116">-</p>
</td>
<td class="cellrowborder" valign="top" width="32.83%" headers="mcps1.3.2.1.2.2.1.1.7.1.5 "><p id="drs_04_0030__en-us_topic_0000001160149294_p2754725112">Use the SHOW TRIGGERS statement to check the character_set_client, collation_connection, and Database Collation attributes.</p>
</td>
<td class="cellrowborder" valign="top" width="18.21%" headers="mcps1.3.2.1.2.2.1.1.7.1.6 "><p id="drs_04_0030__en-us_topic_0000001160149294_p0764745117">-</p>
</td>
</tr>
</tbody>
</table>
</div>
</li></ol>
</li></ul>
<ul id="drs_04_0030__en-us_topic_0000001160149294_ul048151819582"><li id="drs_04_0030__en-us_topic_0000001160149294_li13481185583">Change the default value of the system variable.<p id="drs_04_0030__en-us_topic_0000001160149294_p13853143185818"><a name="drs_04_0030__en-us_topic_0000001160149294_li13481185583"></a><a name="en-us_topic_0000001160149294_li13481185583"></a>The analysis of default values of MySQL 5.7 and MySQL 8.0 Community Edition shows that default values do not affect the migration but affect services after the migration.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_04_0030__en-us_topic_0000001160149294_table27641576596" frame="border" border="1" rules="all"><tbody><tr id="drs_04_0030__en-us_topic_0000001160149294_row775785597"><td class="cellrowborder" rowspan="2" valign="top"><p id="drs_04_0030__en-us_topic_0000001160149294_p18757845916"><strong id="drs_04_0030__en-us_topic_0000001160149294_b1684834874410">No.</strong></p>
</td>
<td class="cellrowborder" rowspan="2" valign="top"><p id="drs_04_0030__en-us_topic_0000001160149294_p9751584597"><strong id="drs_04_0030__en-us_topic_0000001160149294_b10268875172">Parameter/Option</strong></p>
</td>
<td class="cellrowborder" colspan="2" valign="top"><p id="drs_04_0030__en-us_topic_0000001160149294_p1875178185913"><strong id="drs_04_0030__en-us_topic_0000001160149294_b1168771741719">Community</strong></p>
</td>
<td class="cellrowborder" rowspan="2" valign="top"><p id="drs_04_0030__en-us_topic_0000001160149294_p1475385595"><strong id="drs_04_0030__en-us_topic_0000001160149294_b2030945018448">Function</strong></p>
</td>
<td class="cellrowborder" rowspan="2" valign="top"><p id="drs_04_0030__en-us_topic_0000001160149294_p1075583595"><strong id="drs_04_0030__en-us_topic_0000001160149294_b5993511447">Remarks</strong></p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row87519885913"><td class="cellrowborder" valign="top"><p id="drs_04_0030__en-us_topic_0000001160149294_p075128195917"><strong id="drs_04_0030__en-us_topic_0000001160149294_b12211084515">Original Default Value</strong></p>
</td>
<td class="cellrowborder" valign="top"><p id="drs_04_0030__en-us_topic_0000001160149294_p77513810596"><strong id="drs_04_0030__en-us_topic_0000001160149294_b12948225456">New Default Value</strong></p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row157618835911"><td class="cellrowborder" colspan="6" valign="top"><p id="drs_04_0030__en-us_topic_0000001160149294_p117618805911">Server</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row13764885911"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p10761584599">1</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p67608195915">character_set_server</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1976789591">latin1</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p776198175910">utf8mb4</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p5768817595">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p137611825912">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row7761988595"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p97612815597">2</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p20769811594">collation_server</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p476188145910">latin1_swedish_ci</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p4778818598">utf8mb4_0900_ai_ci</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p17758185910">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p107719811596">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row77713885917"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p11771983596">3</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p13771845919">explicit_defaults_for_timestamp</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p187708105915">OFF</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p87710810597">ON</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p15778835917">Specifies whether to update the timestamp column when a row is updated.</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p16771285591">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row107718175911"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p4775812599">4</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p127714805917">optimizer_trace_max_mem_size</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p5771811593">16KB</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1877181597">1MB</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p97716814599">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p4782812599">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row5781813593"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p107898195913">5</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p6780817598">validate_password_check_user_name</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1678481598">OFF</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p978178155911">ON</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1578181595">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1078688593">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row1178689594"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p37818875916">6</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p8784815919">back_log</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1678283593">-1 (autosize) changed from : back_log = 50 + (max_connections / 5)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p197820835913">-1 (autosize) changed to : back_log = max_connections</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p15781384595">Specifies the number of requests that can be stored in the stack in a short period before the MySQL database stops responding to new requests.</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p2781587593">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row5783845915"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p12789835918">7</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p17781486596">max_allowed_packet</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p207819885920">4194304 (4MB)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1379178175917">67108864 (64MB)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p18791089593">Limits the size of data packets received by the server</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1779686598">Use the default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row979108185913"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p8795814591">8</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p16790845919">max_error_count</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p37913810599">64</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p179983596">1024</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p27916814595">Controls the number of alarms to be displayed.</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1279488591">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row079118125918"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p2791385594">9</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p137968135920">event_scheduler</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p2797855911">OFF</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p5791083594">ON</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p16794855920">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p11794875914">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row379168195913"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p12797835919">10</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p12801865919">table_open_cache</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p188015845917">2000</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p14802810595">4000</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p6801983599">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p208015818598">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row68058145910"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p78015819597">11</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p18802819598">log_error_verbosity</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p7802814594">3 (Notes)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p7809845918">2 (Warning)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1480181598">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p38068135917">Use the default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row180208135913"><td class="cellrowborder" colspan="6" valign="top"><p id="drs_04_0030__en-us_topic_0000001160149294_p1380887599">INNODB</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row168048195916"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p080885591">1</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p580198135920">innodb_undo_tablespaces</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p48015875919">0</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p880382591">2</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1801880597">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p8809817598">Use the default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row9803895919"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p681980598">2</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p19817819594">innodb_undo_log_truncate</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p168118895913">OFF</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p2812820593">ON</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1981208145917">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p3811982596">Use the default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row2817805918"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p381188185917">3</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p19811982598">innodb_flush_method</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p6811815597">NULL</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p281680596">fsync (Unix),</p>
<p id="drs_04_0030__en-us_topic_0000001160149294_p68118125917">unbuffered (Windows)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p148110855917">Controls the enabling and writing modes of InnoDB data files and redo logs.</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p148114815591">Use the default value <strong id="drs_04_0030__en-us_topic_0000001160149294_b4319446485">O_DIRECT</strong> for SQL.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row781158155911"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p17814818596">4</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p12818811595">innodb_autoinc_lock_mode</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1181198205917">1 (consecutive)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p881198165910">2 (interleaved)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p188117815913">Controls the behavior of related locks when data is inserted into a table with the <strong id="drs_04_0030__en-us_topic_0000001160149294_b17882311494">auto_increment</strong> column.</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p2811687597">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row9811081595"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p5815825916">5</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p19812812591">innodb_flush_neighbors</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p3819813599">1 (enable)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p158114812598">0 (disable)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p17829812590">Checks whether other dirty pages in the same range are refreshed when refreshing the page from the buffer pool.</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p118220815916">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row138217810592"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1982148155917">6</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p98258155914">innodb_max_dirty_pages_pct_lwm</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p10823805913">0 (%)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p78210812597">10 (%)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p14828814598">Affects the InnoDB dirty page refreshing operation.</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p482684591">Use the default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row48215819598"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p78298175916">7</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p48211865918">innodb_max_dirty_pages_pct</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p14822835910">75 (%)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p158216805916">90 (%)</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p19828818595">Affects the InnoDB dirty page refreshing operation.</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p682148185918">Use the default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row8822812598"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p482680594">PERFORMANCE SCHEMA</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1382108125917">Enabled globally.</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p12826815592">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p582486597">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p58220818593">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p382128195912">Be consistent with the origin default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row108288205910"><td class="cellrowborder" colspan="6" valign="top"><p id="drs_04_0030__en-us_topic_0000001160149294_p6828855915">REPLICATION</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row1283198165910"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p19838816595">1</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p4835835914">log_bin</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p3837810594">OFF</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1283208135916">ON</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p7838811592">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p12831389599">Enabled by default</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row48317813593"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p4837805912">2</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p18310813597">server_id</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p198398115919">0</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p88368195915">1</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p88320819590">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p183483593">If the value is <strong id="drs_04_0030__en-us_topic_0000001160149294_b1570911368594">0</strong>, change it to <strong id="drs_04_0030__en-us_topic_0000001160149294_b10110826708">1</strong>.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row19835845915"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p58388125913">3</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p8838875916">log-slave-updates</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p9831287592">OFF</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p6831889593">ON</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p19831189594">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p148338175910">Enabled by default.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row883178125914"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p483181597">4</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p6838835918">expire_log_days</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p198416895912">0</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p18419813594">30</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1984786597">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p15847815593">Use the default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row284883595"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1084381591">5</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p10845875917">master-info-repository</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p13848818597">FILE</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p4843895915">TABLE</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p48418155914">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1284158145917">Use the default value <strong id="drs_04_0030__en-us_topic_0000001160149294_b4180143310012">TABLE</strong>.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row484188115913"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p118416815911">6</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p284108155913">relay-log-info-repository</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p138718845918">FILE</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p118738115914">TABLE</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p7881186597">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p17882819591">Use the default value <strong id="drs_04_0030__en-us_topic_0000001160149294_b260642110">TABLE</strong>.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row168914855918"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p7897818594">7</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p8897815917">transaction-write-set-extraction</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p13891783595">OFF</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1289158135915">XXHASH64</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p16891089593">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p88988135917">Use the default value.</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row48918812594"><td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p198916845915">8</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p10891819595">slave_rows_search_algorithms</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1789118115914">INDEX_SCAN, TABLE_SCAN</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p1089586596">INDEX_SCAN, HASH_SCAN</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p138912875911">-</p>
</td>
<td class="cellrowborder" valign="top" width="16.666666666666664%"><p id="drs_04_0030__en-us_topic_0000001160149294_p58919818595">Use the default value.</p>
</td>
</tr>
</tbody>
</table>
</div>
</li><li id="drs_04_0030__en-us_topic_0000001160149294_li173461537145813">Remove system variables.<p id="drs_04_0030__en-us_topic_0000001160149294_p95691231316"><a name="drs_04_0030__en-us_topic_0000001160149294_li173461537145813"></a><a name="en-us_topic_0000001160149294_li173461537145813"></a>The analysis of MySQL 5.7 and 8.0 Community Edition shows that removing system variables does not affect migration.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_04_0030__en-us_topic_0000001160149294_table18442304115" frame="border" border="1" rules="all"><thead align="left"><tr id="drs_04_0030__en-us_topic_0000001160149294_row784219305116"><th align="left" class="cellrowborder" valign="top" width="100%" id="mcps1.3.3.2.2.1.2.1.1"><p id="drs_04_0030__en-us_topic_0000001160149294_p1384110301516">System variables</p>
</th>
</tr>
</thead>
<tbody><tr id="drs_04_0030__en-us_topic_0000001160149294_row158422305112"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p68421301117">innodb_locks_unsafe_for_binlog</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row2842630812"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p78422301218">log_builtin_as_identified_by_password</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row18423301619"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p184213301711">old_passwords</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row188429301512"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1084219301315">query_cache_limit</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row178421309110"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1084203017112">query_cache_min_res_unit</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row7842133018115"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p6842930612">query_cache_size</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row3842230414"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p58429301819">query_cache_type</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row1184219303117"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p684210302111">query_cache_wlock_invalidate</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row4842193019110"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p5842183017117">ndb_cache_check_time</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row1184211306110"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p884210301013">ignore_db_dirs</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row484283020110"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1684220302114">tx_isolation</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row20842530819"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p19842163012111">tx_read_only</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row12843730310"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p4842930117">sync_frm</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row1584323019111"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p38435302011">secure_auth</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row98431230215"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p14843630314">multi_range_count</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row98436306111"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p12843103020119">log_error_verbosity</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row2843730517"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1884317307110">sql_log_bin</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row0843133013112"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p2843183012119">metadata_locks_cache_size</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row178430302119"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p284313309113">metadata_locks_hash_instances</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row3843830611"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p3843143017112">date_format</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row148436301117"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p14843530012">datetime_format</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row17843133018118"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1843130114">time_format</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row15843193016120"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p15843130012">max_tmp_tables</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row178434307116"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p198431730717">ignore_builtin_innodb</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row2843103018112"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p2843123017116">innodb_support_xa</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row384317301714"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1984315301617">innodb_undo_logs</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row19844130219"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p1784319301713">innodb_undo_tablespaces</p>
</td>
</tr>
<tr id="drs_04_0030__en-us_topic_0000001160149294_row78441230111"><td class="cellrowborder" valign="top" width="100%" headers="mcps1.3.3.2.2.1.2.1.1 "><p id="drs_04_0030__en-us_topic_0000001160149294_p284415305116">internal_tmp_disk_storage_engine</p>
</td>
</tr>
</tbody>
</table>
</div>
</li></ul>
</div>
<div>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="drs_04_0025.html">Real-Time Migration</a></div>
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