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From: Laurenz Albe <[email protected]>
To: Colin 't Hart <[email protected]>
To: PostgreSQL General <[email protected]>
Subject: Re: wal segment size
Date: Wed, 17 Dec 2025 16:25:17 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAMon-aQ8X7H7jCC6ggKm9Uzcu3KfGVC34RRqKt8BCfpDn2tq9A@mail.gmail.com>
References: <CAMon-aQ8X7H7jCC6ggKm9Uzcu3KfGVC34RRqKt8BCfpDn2tq9A@mail.gmail.com>

On Wed, 2025-12-17 at 16:13 +0100, Colin 't Hart wrote:
> I see very little advice on tuning WAL segment size.
> 
> One of my clients has a few datawarehouses at around 8 - 16 TB
> 
> On one of the nodes there are approx 15000 WAL segments of 16MB each, totalling
> approx 230GB. The archiver is archiving approx one per second, so approx 4 hours to clear.
> 
> Would we gain anything by bumping the WAL segment size?

Very likely yes, if the problem is the overhead of starting the archive_command.

Another thing that can slow down archiving is if you compress these segments
too aggressively.

Yours,
Laurenz Albe

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