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...
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 行锁兼容矩阵(横向是已持有锁,纵向是正在请求的...
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...
“exclusive”, but given that the semantic of this access right is to “prevent insert from happening” several threads can all agree to prevent the same thing without any conflict, thus currently InnoDB treatsS,GAPandX,GAP(or*,GAPlocks, for short) the same way: as conflicting just with*...
正在挂起的锁定的类型。 如果不知道方式,那么此监视器元素的值为 NULL。 表1. 表函数监视信息 表函数监视器元素收集命令和级别 MON_GET_LOCKS 表函数 - 列示当前所连接的数据库中的所有锁定 始终收集 MON_GET_APPL_LOCKWAIT 表函数 - 获取有关应用程序正在等待的锁定的信息 始终收集 表2. 快照监视信息 快照...
(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 ...
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...
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