gap锁(Gap Lock):间隙锁,锁定一个范围,但不包括记录本身。gap锁主要用于防止幻读(Phantom Reads),即当一个事务读取一个范围内的记录时,另一个事务在这个范围内插入了新的记录,导致第一个事务再次读取时看到了“幻影”记录。 3. 说明lock_mode x为何能锁定rec lock_mode x(排他锁)能够锁定rec(记录)是因为它...
lock_mode x locks rec but not gap waiting 这个信息通常出现在数据库系统中,特别是在使用像MySQL这样的关系型数据库时。这个信息描述了锁的行为,特别是行锁(record lock)和间隙锁(gap lock)的区别。 基础概念 行锁(Record Lock):锁定索引记录本身,防止其他事务修改这条记录。 间隙锁(Gap Lock):锁定索...
mysql data_lock表lock_mode取值范围 S,REC_NOT_GAP→ shared access to the record itself (行共享锁,或者行读锁) X,REC_NOT_GAP→ exclusive access to the record itself (行排他锁,或者行写锁) S,GAP→ right to prevent anyone from inserting anything into the gap before the row (共享gap锁) X...
update-wait-lock-mode-x-locks-rec-but-not-gap-vs-update-wait-lock-mode-s-holds-lock-mode-x-locks-rec-but-not-gap === ## 死锁特征 1. update WAITING FOR lock_mode X locks rec but not gap 2. update WAITING FOR lock mode S, HOLDS lock_mode X locks rec but not gap ## 死锁日志...
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记录锁(LOCK RECNOT GAP): lock mode X locks rec but not gap 间隙锁(LOCK GAP): lock mode X locks gap before rec Next-key 锁(LOCKORNIDARY): lock mode X 插入意向锁(LOCK INSERT INTENTION): lock_mode X locks gap before rec insert intention ...
gap locks, if present. For information about S, X, IS, IX, and gap locks, refer to Section 15.7.1, “InnoDB Locking”. --- The description " For InnoDB, permitted values are S[,GAP], X[,GAP], IS[,GAP], IX[,GAP], AUTO_INC, and UNKNOWN." will mislead readers as following...
RECORD LOCKS space id 168 page no 37 n bits 1152 index idx_c1 of table `demodb`.`tb1001` trx id 6349451 lock_mode X locks rec but not gap waiting Record lock, heap no 5 PHYSICAL RECORD: n_fields 2; compact format; info bits 0 0: len 4; hex 8000000a; asc ;; ## c1=10的记...
我们看到了 lock mode S(LOCK_S) locks rec but not gap(LOCK_REC_NOT_GAP)的信息看来没有问题,猜测是实验是一样的,但是还是要源码验证一下。 三、源码验证 1、打印函数lock_print_info_all_transactions /***//** Prints info of locks for each transaction. This function assumes that the caller ho...
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