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Re: How to investigate deadlocks

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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






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