插入意向锁(Insert Intention Lock):事务B在尝试插入数据前会先请求插入意向锁。如果间隙已被事务A的间隙锁锁定,事务B的插入意向锁将处于等待状态,直到事务A的间隙锁被释放。 在这个场景中,lock_mode x locks gap before rec insert intention waiting表明事务B正在等待事务A释放其间隙锁,以便能够获取插入意向锁并插...
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...
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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*,INSERT...
`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...
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...
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...
(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 ...
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1、共享锁/S锁/读锁(Shared Locks) 2、排他锁/X锁/写锁(Exclusive Locks) 3、记录锁(Record Locks) 4、间隙锁(Gap Locks) 5、临键锁(Next-Key Locks) 二、表级别 ...