标签：mysq force zid mit bsp limit ble index select
mysql强制索引和禁止某个索引
1、mysql强制使用索引:force index(索引名或者主键PRI)
例如:
select * from table force index(PRI) limit 2;(强制使用主键) select * from table force index(ziduan1_index) limit 2;(强制使用索引"ziduan1_index") select * from table force index(PRI,ziduan1_index) limit 2;(强制使用索引"PRI和ziduan1_index")
2、mysql禁止某个索引：ignore index(索引名或者主键PRI)
例如:
select * from table ignore index(PRI) limit 2;(禁止使用主键) select * from table ignore index(ziduan1_index) limit 2;(禁止使用索引"ziduan1_index") select * from table ignore index(PRI,ziduan1_index) limit 2;(禁止使用索引"PRI,ziduan1_index")
标签：mysq force zid mit bsp limit ble index select
原文地址：https://www.cnblogs.com/-mrl/p/13088588.html
