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Kill Idle Transactions

This feature limits the age of idle transactions, for all transactional storage engines. If a transaction is idle for more seconds than the threshold specified, it will be killed. This prevents users from blocking InnoDB purge by mistake.

In Percona Server for MySQL Percona Server for MySQL 5.7.17-11 this feature has been re-implemented by setting a connection socket read timeout value instead of periodically scanning the internal InnoDB transaction list.

Version Specific Information

  • Percona Server for MySQL 5.7.10-1: Feature ported from Percona Server for MySQL 5.6.

  • Percona Server for MySQL 5.7.17-11: Feature re-implemented using socket timeouts.

System Variables

innodb_kill_idle_transaction

Option Description
Config file YES
Scope GLOBAL
Dynamic YES
Data type INTEGER
Default 0 (disabled)
Units Seconds

Starting with Percona Server for MySQL 5.7.17-11 this variable is an alias of kill_idle_transaction. To enable this feature, set this variable to the desired seconds wait until the transaction is killed.

NOTE: This variable has been deprecated and it will be removed in a future major release.

kill_idle_transaction

Option Description
Config file YES
Scope GLOBAL
Dynamic YES
Data type INTEGER
Default 0 (disabled)
Units Seconds

The variable has been implemented in Percona Server for MySQL 5.7.17-11. If non-zero, any idle transaction will be killed after being idle for this many seconds.