MYSQL優化（2）——mysql鎖

在這裏插入圖片描述 1.lock table testmysam READ 啓動另外一個session select * from testmysam 可以查詢 2. insert into testmysam value(2); update testmysam set id=2 where id=1; 報錯 3.在另外一個session中 insert into testmysam value

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