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help / color / mirror / Atom feedFrom: Adrian Klaver <[email protected]>
To: Durgamahesh Manne <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: Records count mismatch with logical replication
Date: Tue, 21 Jan 2025 09:56:49 -0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAJCZko+HhLFkiDLDPg3fscUEO4uWyEFT4_e6GBMeywnnwRC-rg@mail.gmail.com>
References: <CAJCZko+gYNGiixGcqKAhjhLhUZ3QQg2rGs6nH7ZUNwTtjYLfGw@mail.gmail.com>
<[email protected]>
<CAJCZko+HhLFkiDLDPg3fscUEO4uWyEFT4_e6GBMeywnnwRC-rg@mail.gmail.com>
On 1/21/25 09:38, Durgamahesh Manne wrote:
>
>
>
> Hi Adrian Klaver
>
> Really Thanks for your quick response
>
> This happened during repack lag went to more than 350Gb then gradually
> decreased to minimal lag after running pg_repack
I don't use pg_repack so I don't know what effect it would have on the
process.
>
> 3) Define how lag is being calculated and what 'minimal' is.
>
> postgres=> select
> slot_name,pg_wal_lsn_diff(pg_current_wal_lsn(),restart_lsn) as bytes_behind,
> pg_size_pretty(pg_wal_lsn_diff(pg_current_wal_lsn(), restart_lsn)) as
> behind_size, active from pg_replication_slots;
> slot_name | bytes_behind | behind_size | active
> -------------+--------------+-------------+--------
> cls_eva_msa | 22906216 | 22 MB | t
>
> 4) Define how the record counts are being derived.
> Source : archiving=> select count(*) from archiving.events_archive ;
> count
> ---------
> 1262908
> (1 row)
>
> Destination : archiving=> select count(*) from archiving.events_archive ;
> count
> ---------
> 1252062
> (1 row)
22,906,216 bytes/10,846 rows works out to 2112 bytes per row.
Is that a reasonable per row estimate?
>
> 5) The network distance between the servers.
>
> Both are under same vpc security groups
>
> Regards
> Durga Mahesh
--
Adrian Klaver
[email protected]
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