模拟优化参数optimizer_switch选项mrr(Multi_Range Read)对查询优化的影响
11.1背景:模拟优化参数optimizer_switch选项mrr(Multi_RangeRead)对查询优化的影响11.2建表语句mysql>showcreatetableorder_line\G;***************************1.row***************************Table:order_lineCreateTable:CREATETABLE`