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Update MySQL.md

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@ -132,7 +132,7 @@ MVCC 可以看作是行级锁的一个升级，可以有效减少加锁操作，
- Record lock：记录锁，单个行记录上的锁
- Gap lock：间隙锁，锁定一个范围，不包括记录本身
- Next-key lock：record+gap临键锁，锁定一个范围，包含记录本身
- Next-key lock：record+gap 临键锁，锁定一个范围，包含记录本身
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