mysql deadlock

MySQL redo deadlock troubleshooting and troubleshooting process analysis, mysqlredo Problem background I went to work on Monday. I first asked my colleagues about the test results last week. I was told that MySQL Server hang is in multiple instance scenarios and cannot be tested. The native version does not have this problem, this problem occurs in the new versio

* -- Process deadlocks to view the current process, or deadlocked process, and automatically kill the dead process because it is targeted to death. if there is a deadlock process, you can only view the deadlocked process, you can use parameter control to check only the deadlock process -- deadlock creation 2004.4 -- ** -- call example execp_lockinfo -- * createpr

Deal1, query whether the lock tableShow OPEN TABLES where In_use > 0;Viewing transactions that are being lockedSELECT * from INFORMATION_SCHEMA. Innodb_locks;View transactions waiting for a lockSELECT * from INFORMATION_SCHEMA. Innodb_lock_waits;2. Query processShow Processlist;ID #ID标识 useful when you want to kill a statementUse #当前连接用户Host #显示这个连接从哪个ip的哪个端口上发出DB #数据库名Command #连接状态, usually sleep (sleep), query, connection (connect)Time #连接持续时间, Unit is secondsState #显示当前sql语句的状态Info #显示这个sql语句

MySQL deadlock causes query resolution. Recently, when the database is being maintained, the data cannot be stored into the database during data parsing. The reason is that MySQL transactions have deadlocked. I restarted MySQL several times before. Www.2cto.com has recently discovered frequent occurrences. So find a me

Tags: title $ main print txt for net first show1. View the list of processes and find the IDSHOW processlist2, the query statement to lock the table, hurriedly find the first locked thread_id, in the shell of MySQL execution.Kill ID#!/bin/bashMysql-u root-e "Show Processlist" | Grep-i "Locked" >> locked_log.txtFor line in ' Cat Locked_log.txt | awk ' {print '} 'Doecho "Kill $line;" >> Kill_thread_id.sqlDoneNow Kill_thread_id.sql's content looks like t

Familiar with or understand the database of friends are aware of the concept of lock, here do not do too much analysis! There are many kinds of locks, and different database lock management methods are different. Here is the main talk about the deadlock under the MySQL InnoDB engine.The common thing about deadlocks is that 2 of transactions ask each other to hold locks, which can cause 2 transactions to wai

Tags: Ted mic error log class and OSS info dev border introduced 5.6.2 command-line Format --innodb-print-all-deadlocks=# system Variable name innodb_print_all_deadlocks scope global dynamic yes permitted Values type boolean default off When this option was enabled, information about

Tags: mysql deadlockThis is the InnoDB type of deadlock!I found a lot of things on the Internet. Various commands to view the deadlock information, the following can be used:Show engine InnoDB status (varies by MySQL version)This command is executed after the MySQL command l

statement again, it will execute normally, as follows:mysql> Update order_info set province_id=15, city_id= 1667 where order_from=10 and order_out_sn= ' 1407261241xxxx ';Query OK, 1 row Affected (0.00 sec)Rows matched:1 changed:1 warnings:0 Mysql>4, summary analysisThe table data volume is not big, according to the normal situation, the simple update should not cause blocking, MySQL is autocommit, will not

The MyISAM and memory storage engines use a table-level lock Table-level locking Dead lockthe so-called deadlock A phenomenon of waiting for resources that cannot be pushed forward without external forces.At this point, the system is called a deadlock state or the system produces a deadlock, and these aulympic processes are called

Problem backgroundI went to work on Monday. I first asked my colleagues about the test results last week. I was told that MySQL Server hang can't be tested in multi-instance scenarios,The native version does not have this problem, but this problem occurs in the new version.I was so shocked that I felt strange. Fortunately, the environment was still on the site and provided a good environment for troubleshooting. Then I went into the intense troubl

Problem background Working in Monday, I first learned about last week's Test with my colleagues, be told in a multi-instance scenario MySQL Server hang Live, unable to test, the original version does not exist this problem, and the new version of this problem, can not help but feel a shiver, the heart can not help feeling strange, fortunately, the scene environment is still in, Provides a good environment for troubleshooting problems and then puts th

During database maintenance recently, data cannot be stored into the database during data parsing. The reason is that MySQL transactions have deadlocked. I restarted MySQL several times before. During database maintenance recently, data cannot be stored into the database during data parsing. The reason is that MySQL transactions have deadlocked. I restarted

The principle of the table locking method used for Write,mysql is as follows: If there is no lock on the table, put a write lock on it.Otherwise, the lock request is placed in the write lock queue. The locking method used for Read,mysql is as follows: If there is no write lock on the table, put a read lock on it.Otherwise, the lock request is placed in the read lock queue. When a lock is freed, the lock

During database maintenance recently, data cannot be stored into the database during data parsing. The reason is that MySQL transactions have deadlocked. I restarted MySQL several times before. Recent frequent occurrences. So find a method. Select * From information_schema.innodb_trx; View events that take a long time. Select sysdate (); am and the start time of the transaction is am. The display is abno

; SELECT * from Innodb_locks; SELECT * from Innodb_trx; Connection query, only need to use this SQL to query the above three tables of information Select a.requesting_trx_id, C.lock_mode as Wait_lock_mode, C.lock_type as Wait_lock_type, c.lock_table as Wait_ Lock_table, C.lock_index as Wait_lock_index, c.lock_data as Wait_lock_data, E.trx_state as Wait_trx_state, E.trx _query as Wait_trx_query, A.blocking_trx_id,b.lock_mode as Block_lock_mode, B.lock_type as Block_lock_type, B.lock_tabl

Tags: www. Nod fetch number INNODB show state details extraction method--more needs to be understoodhttp://hedengcheng.com/?p=577--Ho Dengcheng on the Where extractionHttp://www.cnblogs.com/metoy/p/5545580.html--About the deadlock analysis 1Http://www.jb51.net/article/32651.htm--About the deadlock analysis 2http://hedengcheng.com/?p=844--About deadlock Ho Dengche

Referring to the index, the first thought is the efficiency improvement, query speed, unconsciously there will be a psychological trend, tube it 3,721, the first index to improve efficiency. But the index is actually a hidden ...Today, the Test Belt optimization project, open jmeter High concurrent access to the project, the background attached to MySQL through the show processlist command to view the query situation, found that some SQL statements ne

message_id=;UPDATE message SET gmt_modified = Now (), deal_times = Deal_times +1, status = ' sending ', gmt_retry = ' 2012-11-17 23 : 54:10 'WHERE message_id=;INSERT into message (body, user_id,status,message_type,version,deal_times,gmt_create,gmt_modified,gmt_retry) values (' Hello world! ', -2, ' sending ', ' Instance_status_sync ', 1,17,now (), now (), now ());INSERT into message (body, user_id,status,message_type,version,deal_times,gmt_create,gmt_modified,gmt_retry) values (' Hello!', -1, '

(transactionstatus status) { try { For (Long id:idlist) { "White-space:pre" > 1) } return null; }catch (Daoexception e) { Status.setrollbackonly (); return e; } catch (Exception e) { Status.setrollbackonly (); return e; } } }); Summary: in MySQL with InnoDB, the update operation by default will add row-level locks, row-level locks are based on the index, before the deadlock