Re: Wal file increase

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From: kasem adel <[email protected]>
To: Laurenz Albe <[email protected]>
To: pgsql-admin <[email protected]>
Subject: Re: Wal file increase
Date: Mon, 15 Dec 2025 08:19:40 +0000
Message-ID: <AM4P193MB29416485C01CC7DCC529C592AEADA@AM4P193MB2941.EURP193.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <[email protected]>
References: <CAP-pBm9kY6HafeGD-1vrL8UqaQLu2jFJthBjyOsypY=iGJRBxA@mail.gmail.com>
	<[email protected]>
	<AM4P193MB2941220558624561A6A5F6EBAEADA@AM4P193MB2941.EURP193.PROD.OUTLOOK.COM>
	<[email protected]>

Dear @Laurenz Albe<mailto:[email protected]>,

-What exactly is a "replication interruption", and how do you diagnose it?
We see replication slot restart every time in these period
- Are you using streaming replication or logical replication?
I have streaming replication for one node and another logical replication
- If it is streaming replication, are you using a replication slot?
Yes have replication slot
- It is expected that if you suspend replication and have a replication slot, WAL will
  pile up on the primary.  But what is the connection with pg_basebackup?
Yes still exist.
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________________________________
من: Laurenz Albe <[email protected]>
‏‏تم الإرسال: Monday, December 15, 2025 10:09:00 AM
إلى: kasem adel <[email protected]>; pgsql-admin <[email protected]>
‏‏الموضوع: Re: Wal file increase

On Mon, 2025-12-15 at 07:25 +0000, kasem adel wrote:
> Thanks for your support We have physical replication connection with Postgres node standby
> and have another replication slot with logical replication with another node and every day
> after run pg_basebackup we face huge number of file created and size per every hour is 23GB
> and in normal size is 0.8 GB and in logical replication we see in logs it’s in same
> checkpoint but baseline change and we run pg_basebackup with -X fetch -C fast.

pg_basebackup does not increase the WAL volume, except by the full-page images that get
written after any checkpoint.  So you'd need to find an explanation for that.

"-X fetch" is not a good choice.  Use "-X stream".

Anyway, you didn't answer all my questions.

Yours,
Laurenz Albe

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