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idle_in_transaction_session_timeout

Type: integer
Default: 0
Min: 0
Max: 2147483647
Unit: milliseconds (ms)
Context: user
Restart: false
Since: 9.6

Terminate any session with an open transaction that has been idle for longer than the specified amount of time. This allows any locks held by that session to be released and the connection slot to be reused; it also allows tuples visible only to this transaction to be vacuumed. See routine-vacuuming for more details about this.

If this value is specified without units, it is taken as milliseconds. A value of zero (the default) disables the timeout.

Recommendations

Set to 1 hour maximum, or as low as 1 minute if you know your query load well. Idle transactions are bad news.

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