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Lu, Huayi
7505fe85a9
Reviewed-by: Kacur, Michal <michal.kacur@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
15 lines
1.5 KiB
HTML
15 lines
1.5 KiB
HTML
<a name="EN-US_TOPIC_0000001381728585"></a><a name="EN-US_TOPIC_0000001381728585"></a>
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<h1 class="topictitle1">What Are Partitioned Tables, Partitions, and Partition Keys?</h1>
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<div id="body0000001381728585"><p id="EN-US_TOPIC_0000001381728585__en-us_topic_0000001201378218_p8060118">Partitioned table: Partitioning refers to splitting what is logically one large table into smaller physical pieces based on specific schemes. The table based on the logic is called a partitioned table, and a physical piece is called a partition. Data is stored on these smaller physical pieces, namely, partitions, instead of the larger logical partitioned table.</p>
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<p id="EN-US_TOPIC_0000001381728585__en-us_topic_0000001201378218_p1346017250911">Partition: In the GaussDB(DWS) distributed system, data partitioning is to horizontally partition table data within a node based on a specified policy. The table is divided into partitions that do not overlap within a specific range.</p>
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<p id="EN-US_TOPIC_0000001381728585__en-us_topic_0000001201378218_p2280148142316">Partition key: A partition key is an ordered set of one or more table columns. The values in the table partition keys are used to determine the data partition that a row belongs to.</p>
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<p id="EN-US_TOPIC_0000001381728585__en-us_topic_0000001201378218_p131468262814"></p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_03_0065.html">Database Usage</a></div>
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