Re: How to investigate deadlocks

Am 02.10.23 um 13:27 schrieb Matthias Apitz:
> Hello,
>
> One of our clients running our LMS on top of PostgreSQL 13.1 created a
> ticket with these messages:
>
> 2023-09-30 16:50:50.951 CEST [18117] ERROR: deadlock detected
> 2023-09-30 16:50:50.951 CEST [18117] DETAIL: Process 18117 waits for ShareLock on transaction 150396154; blocked by process 18187.
> Process 18187 waits for ShareLock on transaction 150396155; blocked by process 18117.
> Process 18117: fetch hc_d03geb
> Process 18187: fetch hc_d02ben
> 2023-09-30 16:50:50.951 CEST [18117] HINT: See server log for query details.
> 2023-09-30 16:50:50.951 CEST [18117] CONTEXT: while locking tuple (38,57) in relation "d03geb"
> 2023-09-30 16:50:50.951 CEST [18117] STATEMENT: fetch hc_d03geb
>
> The shown PIDs for sure are the ones of the Pos backend proc (on Linux).
> Is there any chance to investigate it further?

please also check
https://www.cybertec-postgresql.com/en/postgresql-understanding-deadlocks/

Andreas

--
Andreas Kretschmer
Technical Account Manager (TAM)
www.enterprisedb.com