事务号为2322，活跃 6秒，starting index read 表示事务状态为根据索引读取数据。常见的其他状态有:mysql tables in use 1 说明当前的事务使用一个表。locked 1 表示表上有一个表锁，对于 DML 语句为 LOCK_IX LOCK WAIT 2 lock struct(s), heap size 1136, 1 row lock(s)LOCK WAIT 表示正在等待锁，2 lo...
| innodb_flush_log_at_timeout | 1 | | innodb_lock_wait_timeout | 120 | | innodb_rollback_on_timeout | OFF | | interactive_timeout | 28800 | | lock_wait_timeout | 31536000 | | net_read_timeout | 30 | | net_write_timeout | 60 | | slave_net_timeout | 3600 | | wait_ti...
脏读(dirty read):一个事务正在对一条记录做修改,在这个事务完成并提交前,这条记录的数据就处于不一致状态;这时,另一个事务也来读取同一条记录,如果不加控制,第二个事务读取了这些“脏”数据,并作进一步处理,会产生未提交的数据依赖关系。这种现象被称为脏读。 不可重复度(non-repeatable read):一个事务在读...
trx_requested_lock_id: 3669D83:49:3:4 ##请求的锁ID trx_wait_started: 2010-12-24 13:40:07 trx_weight: 2 trx_mysql_thread_id: 2346 ##线程 ID trx_query: update tx1 set c1=’heyfffff’,c2=’heyffffff’ where id =3 trx_operation_state: starting index read trx_tables_in_use: 1...
Lock mysql wait 问题排查 mysql nolock 七、MySQL的锁 首先区分一下“锁”的概念,在数据库中lock和latch都称为“锁”,其中latch称为闩锁(轻量级锁),锁定的时间短,在InonoDB中又可分为mutex(互斥量)和rwlock(读写锁),目的是保证并发线程操作临界资源的正确性,保护的对象是线程,保护的是内存数据结构,没有死锁...
showengine innodb status \G---TRANSACTION 6334476, ACTIVE 10 sec starting index readmysql tablesinuse1, locked1LOCK WAIT2lock struct(s), heap size1136,1rowlock(s) MySQL thread id3162313, OS thread handle140610455860992, query id44173872172.16.24.1mysql_admin statisticsselect*fromtb1001whereid=1...
info bits 0 0: len 10; hex 37323633333937323431; asc 7263397241;; 1: len 6; hex 0000191cadf5; asc ;; 2: len 7; hex 8100000ac80110; asc ;; *** (2) TRANSACTION: TRANSACTION 421310042, ACTIVE 1 sec starting index read mysql tables in use 1, locked 1 LOCK WAIT 3 lock struct(s)...
OS thread id 2422524848 starting index read mysql tables in use 1, locked 1 LOCK WAIT 2 lock struct(s), heap size 320, 1 row lock(s) MySQL thread id 618, query id 47824 Updating update Ispserviceorder set action='CreateTerminal', ispid=12, macaddr='00:00:00:00:00:2D', numberRet...
ACTIVE 209 sec starting index read mysql tables in use 1, locked 1 LOCK WAIT 4 lock struct(s), heap size 1128, 2 row lock(s) MySQL thread id 18, OS thread handle 139815618148096, query id 146 localhost u1 updating UPDATE Birds SET value=40 WHERE name='Buzzard' RECORD LOCKS space id...
Description Very sporadically I am getting Lock wait timeout exceeded errors from MySQL. These appear in Craft logs like: Next yii\db\Exception: SQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try res...