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From: Laurenz Albe <[email protected]>
To: James Pang <[email protected]>
To: [email protected]
Subject: Re: a lot of session wait on lock relation
Date: Thu, 15 May 2025 14:08:05 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAHgTRfdEVMi_YVuq3M4R4uARhXQ8ZgkMid3LhxjFbS+Y+Z_8GQ@mail.gmail.com>
References: <CAHgTRfdEVMi_YVuq3M4R4uARhXQ8ZgkMid3LhxjFbS+Y+Z_8GQ@mail.gmail.com>

On Thu, 2025-05-15 at 16:27 +0800, James Pang wrote:
> PGv 15.10,  many session coming in doing "insert into tablexxx values...." in parallel,
> this is a range partition tables, total 12 partitions plus one default partition,
> only three btree indexes, no others constraints ,no foreign key. but we see hundreds
> of session waiting on "lock:relation", why inserts into partition table cause "relation lock" ?

Something else does; use the pg_blocking_pids() function with the process ID of
a blocked backend to find out who is holding the lock.

If you have hundreds of sessions, you are allowing to many connections.

Yours,
Laurenz Albe

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