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...
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...
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...
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(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 ...