生产环境MySQL索引时效的排查过程是什么
作者:WeekendFlower
时间:2023-05-01
浏览:1
问题:mysql>explainSELECT*FROMartisan_incomeWHEREparent_idIN(222645481,222583953,222181775,222180931,222081126,221678753,221616102,221591783,221219312,221195482,221118672,220763129,220654289,220633930,220323633,220227641,219825564,219720338,219321345,2192919
本文目录
问题:
mysql>explain SELECT * FROM artisan_income WHERE parent_id IN ( 222645481, 222583953, 222181775, 222180931, 222081126, 221678753, 221616102, 221591783, 221219312, 221195482, 221118672, 220763129, 220654289, 220633930, 220323633, 220227641, 219825564, 219720338, 219321345, 219291958 ) \G *************************** 1. row *************************** id: 1 select_type: SIMPLE table: artisan_income partitions: type: ALL possible_keys: idx_parent_id key: key_len: ref: rows: 20711352 filtered: 100 Extra: Using where
确实是全表扫描,带着疑问我们把生产环境数据同步到测试库,方便测试,然后在测试环境进行查询。
mysql>explain SELECT * FROM artisan_income WHERE parent_id IN ( 222645481, 222583953, 222181775, 222180931, 222081126, 221678753, 221616102, 221591783, 221219312, 221195482, 221118672, 220763129, 220654289, 220633930, 220323633, 220227641, 219825564, 219720338, 219321345, 219291958 ) \G *************************** 1. row *************************** id: 1 select_type: SIMPLE table: artisan_income partitions: type: range possible_keys: idx_parent_id key: idx_parent_id key_len: 5 ref: rows: 1870780 filtered: 100 Extra: Using index condition
发现在测试环境就用到了parent_id字段的索引,生产库和测试库同样都是5.7的版本,数据也几乎一样,但是执行计划不一样,第一时间想到了统计信息的问题,于是进行analyze table
analyze table artisan_income;
然后查看执行计划:
mysql>explain SELECT * FROM artisan_income WHERE parent_id IN ( 222645481, 222583953, 222181775, 222180931, 222081126, 221678753, 221616102, 221591783, 221219312, 221195482, 221118672, 220763129, 220654289, 220633930, 220323633, 220227641, 219825564, 219720338, 219321345, 219291958 ) \G *************************** 1. row *************************** id: 1 select_type: SIMPLE table: artisan_income partitions: type: range possible_keys: idx_parent_id key: idx_parent_id key_len: 5 ref: rows: 1901880 filtered: 100 Extra: Using index condition
发现执行计划已经恢复正常。
mysql>SELECT * FROM artisan_income WHERE parent_id IN ( 222645481, 222583953, 222181775, 222180931, 222081126, 221678753, 221616102, 221591783, 221219312, 221195482, 221118672, 220763129, 220654289, 220633930, 220323633, 220227641, 219825564, 219720338, 219321345, 219291958 ) \G 返回行数:[0],耗时:2 ms.
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