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ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

原创 MySQL 作者:denglt 时间:2014-02-13 15:27:46 0 删除 编辑
ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction



Command-Line Format --innodb_lock_wait_timeout=#
Option-File Format innodb_lock_wait_timeout
System Variable Name innodb_lock_wait_timeout
Variable Scope Global, Session
Dynamic Variable Yes
  Permitted Values
Type numeric
Default 50
Range 1 .. 1073741824

The length of time in seconds an InnoDB transaction waits for a row lock before giving up. The default value is 50 seconds. A transaction that tries to access a row that is locked by another InnoDB transaction waits at most this many seconds for write access to the row before issuing the following error:

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

When a lock wait timeout occurs, the current statement is rolled back (not the entire transaction). To have the entire transaction roll back, start the server with the --innodb_rollback_on_timeout option. See alsoSection, “InnoDB Error Handling”.

You might decrease this value for highly interactive applications or OLTP systems, to display user feedback quickly or put the update into a queue for processing later. You might increase this value for long-running back-end operations, such as a transform step in a data warehouse that waits for other large insert or update operations to finish.

innodb_lock_wait_timeout applies to InnoDB row locks only. A MySQL table lock does not happen insideInnoDB and this timeout does not apply to waits for table locks.

The lock wait timeout value does not apply to deadlocks, because InnoDB detects them immediately and rolls back one of the deadlocked transactions.

As of MySQL 5.5, innodb_lock_wait_timeout can be set at runtime with the SET GLOBAL or SET SESSIONstatement. Changing the GLOBAL setting requires the SUPER privilege and affects the operation of all clients that subsequently connect. Any client can change the SESSION setting for innodb_lock_wait_timeout, which affects only that client.

超时由 TransactionDeadlockDetectionTimeout参数控制,注意该参数在管理节点的config.ini文件的[ndbd default] or [ndbd]定义
Effective Version Type/Units Default Range/Values
NDB 7.3.0 milliseconds 1200 50 - 4G
Restart Type: N

(See Section, “MySQL Cluster Data Node Configuration Parameters”, for information about restart types.)

When a node executes a query involving a transaction, the node waits for the other nodes in the cluster to respond before continuing. A failure to respond can occur for any of the following reasons:

  • The node is dead

  • The operation has entered a lock queue

  • The node requested to perform the action could be heavily overloaded.

This timeout parameter states how long the transaction coordinator waits for query execution by another node before aborting the transaction, and is important for both node failure handling and deadlock detection.

The default timeout value is 1200 milliseconds (1.2 seconds).

The minimum for this parameter is 50 milliseconds.

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