1. 解释"lock_mode x locks rec but not gap"的含义 lock_mode x:这里的x代表排他锁(Exclusive Lock),它是InnoDB中最严格的锁模式,用于阻止其他事务对同一资源(如行记录)进行任何类型的访问(读取或写入)。 locks rec:表示锁被放置在特定的记录(record)上。 but not gap:表示这个锁不锁定记录之间的间隙(gap...
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...
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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...
X→ is like a combination ofX,REC_NOT_GAPandX,GAPat the same time. So it is an exclusive access right to the row, and prevents insert before it. (排他邻键锁) X,GAP,INSERT_INTENTION→ right to insert a new row into the gap before this row. Despite “X” in its name it is act...
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 ...
Description:https://dev.mysql.com/doc/refman/8.0/en/performance-schema-data-locks-table.htmlLOCK_MODE How the lock is requested. The value is storage engine dependent. For InnoDB, permitted values are S[,GAP], X[,GAP], IS[,GAP], IX[,GAP], AUTO_INC, and UNKNOWN. Lock modes other th...
(4, "valerii") --- TRX HAS BEEN WAITING 9 SEC FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 244 page no 4 n bits 72 index `i` of table `test`.`t` trx id 35970 lock_mode X locks gap before rec insert intention waiting Record lock, heap no 4 PHYSICAL RECORD: n_fields ...
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...
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