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this PR Repla Reviewed-by: Székely, Ond <ond.szekely@t-systems.com> Co-authored-by: proposalbot <proposalbot@otc-service.com> Co-committed-by: proposalbot <proposalbot@otc-service.com>
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18 lines
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:original_name: en-us_topic_introduction.html
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.. _en-us_topic_introduction:
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What Is DDS?
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============
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Document Database Service (DDS) is a high availability DBaaS, which provides a secure, reliable and scalable solution, compatible with MongoDB. It provides functions such as one-click deployment, elastic capacity expansion, disaster recovery, backup, restoration, monitoring, and alarm reporting.
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DDS has the following features:
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- DDS automatically establishes the three-node replica set architecture. It supports fast deployment, high availability (HA) data storage, data redundancy, and failover.
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- DDS provides sharded cluster instances comprised of a config node paired with multiple shards and mongos nodes. These clusters can be easily scaled up to enhance read and write performance.
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- DDS lets you back up or restore a database from the management console in just a few clicks.
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- DDS provides performance metrics and you can configure alarm notifications to make it easier to keep abreast of instance statuses.
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For details about the compatible DB engines and versions, see :ref:`Database Engine and Version <dds_01_0014>`.
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