05 2023 档案

mysql执行优化器
摘要：mysql选错驱动表 这个ql看着给人感觉t表是驱动表,其实优化器优化后trc才是驱动表，因为t的查询条件筛选出来有50多万,二trc筛选只有几千条 explain select distinct t.`id` as "id", t.deleted as "deleted", t.no as "no 阅读全文
posted @ 2023-05-30 17:51 意犹未尽 阅读(28) 评论(0) 推荐(1)