快两年没写过业务代码了…… 今天帮一个研发团队优化了一下数据库表的查询性能。使用的是表分区。 简单记录了一下步骤,方便直接用:
1. 使用 Trade_Date 新建表分区,从 4 月建立到 2021-6,每月一个单独的分区:
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')) );
2. 到明年6月以后,使用以下语句添加新分区:
ALTER TABLE tbl_original_data
ADD PARTITION (PARTITION p15 values less than (unix_timestamp('2021-08-01 00:00:00')))
3. 因为现有查询已经带上 Trade_Date 字段条件,所以不用修改查询和程序。
优化完成后,该查询由每次7秒,降低到每次 0.4 秒左右。