Re: Limit transaction lifetime

On 06/03/2020 14:24, Andrei Zhidenkov wrote:
> Is there a way to limit a transaction lifetime in PostgreSQL? I could
> use `idle_in_transaction_session_timeout` parameter but it applies only
> to IDLE transactions. However, I want to rollback any transaction that
> executes more than specified period of time.
>
> --
>
> With best regards, Andrei Zhidenkov.

If it's a single command you're trying to limit `SET statement_timeout
TO <whatever>` should do the trick.

If you want it based on the session's cumulative statement time, off the
top of my head I can't think of anything in vanilla PG without using
executor hooks (that requires some coding).

If the queries that worry you are long-lived, you might be able to get
by with a scheduled process checking against pg_stat_activity (eg:
age(query_start)) and adding the current query's run-time to some
per-session total, but it's an highly inaccurate process.

--
Regards

Fabio Ugo Venchiarutti
OSPCFC Network Engineering Dpt.
Ocado Technology

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