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help / color / mirror / Atom feedFrom: Durgamahesh Manne <[email protected]>
To: Laurenz Albe <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: Regarding query optimisation (select for update)
Date: Tue, 15 Jul 2025 18:26:34 +0530
Message-ID: <CAJCZkoLJ6G9J3iK591o35UaKu3x7Kn96ma-u_yqGNgkrLjf6ag@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CAJCZko+fiU+=NSEGY7d7YMpFxg_jANpiO-LU6ur+yqRc_Ej6eQ@mail.gmail.com>
<[email protected]>
On Tue, Jul 15, 2025 at 6:14 PM Laurenz Albe <[email protected]>
wrote:
> On Tue, 2025-07-15 at 15:40 +0530, Durgamahesh Manne wrote:
> > We are facing issues with slow running query
> > SELECT betid, versionid, betdata, processed, messagetime, createdat,
> updatedat
> > FROM praermabetdata where processed = 'false'
> > ORDER BY betid, versionid LIMIT 200 OFFSET 0 FOR UPDATE;
> >
> > QUERY PLAN
> >
> --------------------------------------------------------------------------------------------------------------------------------
> > Limit (cost=0.28..1.89 rows=1 width=78)
> > -> LockRows (cost=0.28..1.89 rows=1 width=78)
> > -> Index Scan using
> idx_praermabetdata_processed_betid_versionid on praermabetdata
> (cost=0.28..1.88 rows=1 width=78)
> > Index Cond: (processed = false)
> >
> > image.png
> >
> > Do we have any alternative way to improve the performance?
> > Sometimes processed column use true as well as false
>
> Please provide EXPLAIN (ANALYZE, BUFFERS) output and use "log_lock_waits"
> to see if you are hanging behind locks for a longer time.
>
> Yours,
> Laurenz Albe
>
Hi Team
[image: image.png]
I can use log_lock_waits to check further information
Regards,
Durga Mahesh
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Subject: Re: Regarding query optimisation (select for update)
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