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doc-exports/docs/dws/dev/dws_04_0481.html
Lu, Huayi a24ca60074 DWS DEVELOPER 811 version 
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-authored-by: Lu, Huayi <luhuayi@huawei.com>
Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
2023-01-19 13:37:49 +00:00

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Case: Adjusting the Partial Clustering Key

Symptom

Information on the EXPLAIN PERFORMANCE at a site is as follows: As shown in the red boxes, two performance bottlenecks are scan operations in a table.

Optimization Analysis

After further analysis, we found that the filter condition acct_id ='A012709548':: bpchar exists in the two tables.

Try to add the partial clustering key in the acct_id column of the two tables, and run the VACUUM FULL statement to make the local clustering take effect. The table performance is improved.

Parent topic: Optimization Cases