快兩年沒寫過業務代碼了……
今天幫一個研發團隊優化了一下數據庫表的查詢性能。使用的是表分區。
簡單記錄了一下步驟,方便直接用:
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使用 Trade_Date 新建表分區,從 4 月建立到 2021-6,每月一個單獨的分區:
ALTER TABLE tbl_original_data PARTITION BY RANGE(unix_timestamp(Trade_Date))( partition p0 values less than (unix_timestamp('2020-05-01 00:00:00')), partition p1 values less than (unix_timestamp('2020-06-01 00:00:00')), partition p2 values less than (unix_timestamp('2020-07-01 00:00:00')), partition p3 values less than (unix_timestamp('2020-08-01 00:00:00')), partition p4 values less than (unix_timestamp('2020-09-01 00:00:00')), partition p5 values less than (unix_timestamp('2020-10-01 00:00:00')), partition p6 values less than (unix_timestamp('2020-11-01 00:00:00')), partition p7 values less than (unix_timestamp('2020-12-01 00:00:00')), partition p8 values less than (unix_timestamp('2021-01-01 00:00:00')), partition p9 values less than (unix_timestamp('2021-02-01 00:00:00')), partition p10 values less than (unix_timestamp('2021-03-01 00:00:00')), partition p11 values less than (unix_timestamp('2021-04-01 00:00:00')), partition p12 values less than (unix_timestamp('2021-05-01 00:00:00')), partition p13 values less than (unix_timestamp('2021-06-01 00:00:00')), partition p14 values less than (unix_timestamp('2021-07-01 00:00:00')) );
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到明年6月以後,使用以下語句添加新分區:
ALTER TABLE tbl_original_data ADD PARTITION (PARTITION p15 values less than (unix_timestamp('2021-08-01 00:00:00')))
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因爲現有查詢已經帶上 Trade_Date 字段條件,所以不用修改查詢和程序。