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Lu, Huayi
e6fa411af0
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
14 lines
1.6 KiB
HTML
14 lines
1.6 KiB
HTML
<a name="EN-US_TOPIC_0000001233883167"></a><a name="EN-US_TOPIC_0000001233883167"></a>
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<h1 class="topictitle1">Using Partitioned Tables</h1>
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<div id="body8662426"><p id="EN-US_TOPIC_0000001233883167__a0111a220c81446cd812b626c245f69bf">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. A partitioned table has the following advantages over an ordinary table:</p>
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<ol id="EN-US_TOPIC_0000001233883167__o3a31dd7e8c6a4dd781902f5a68d88823"><li id="EN-US_TOPIC_0000001233883167__lfe24045884044943998e00a039136691">High query performance: The system queries only the concerned partitions rather than the whole table, improving the query efficiency.</li><li id="EN-US_TOPIC_0000001233883167__l453d8600d652437c854e35468fd55253">High availability: If a partition is faulty, data in the other partitions is still available.</li><li id="EN-US_TOPIC_0000001233883167__l8e7975db193245eab9d254399bb252bd">Easy maintenance: You only need to fix the faulty partition.</li></ol>
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<p id="EN-US_TOPIC_0000001233883167__ad1078cea943043b1a4b89511037a7355"><span id="EN-US_TOPIC_0000001233883167__text253465916">GaussDB(DWS)</span> supports range partitioned tables and list partitioned tables.</p>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_04_0437.html">Reviewing and Modifying a Table Definition</a></div>
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