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help / color / mirror / Atom feedFrom: Nikolay Samokhvalov <[email protected]>
To: Eric Schwarzenbach <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: can a blocked transaction affect the performance of one that is blocking it?
Date: Mon, 9 Dec 2024 15:10:32 -0800
Message-ID: <CAM527d_JP20hZ9bLKWUmMXx_bQms4B=W4321HApfcQ98cx_1HA@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
On Mon, Dec 9, 2024 at 13:16 Eric Schwarzenbach <[email protected]>
wrote:
> Hi,
>
> Could one transaction (one that should be relatively simple and short)
> cause another complex, long running transaction (involving INSERTS, on a
> table the first transaction may be reading from) to take many orders of
> magnitude longer than it would normally? (short of competing for system
> resources, like CPU time etc, of course)
>
> I don't believe my scenario involved a deadlock but I expect my short
> transaction was probably blocked by my long one. Does it make any sense
> that this could very significantly affect the performance of the
> non-blocked transaction?
>
> Thanks,
>
> Eric
Have you tried wait event analysis (looking at wait_event_type, wait_event,
state, query samples from pg_stat_activity)?
>
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Subject: Re: can a blocked transaction affect the performance of one that is blocking it?
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