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help / color / mirror / Atom feedFrom: Raj <[email protected]>
To: Thomas Carroll <[email protected]>
Cc: Pgsql-admin <[email protected]>
Subject: Re: Wal_keep_size
Date: Tue, 7 Oct 2025 10:24:51 +0530
Message-ID: <CAJk5Ata7Kz-k=KfEyZVhckVgrk8_faNgGd3RcRnV2tzqs_D5ig@mail.gmail.com> (raw)
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On Tue, 7 Oct 2025, 10:22 Raj, <[email protected]> wrote:
> If wal_keep_size is more than max_wal_size wouldn't it always trigger
> checkpoint ?
>
> On Tue, 7 Oct 2025, 03:08 Thomas Carroll, <[email protected]> wrote:
>
>> Hope nobody minds me chipping in here.
>>
>> The answer is "not necessarily." The names make them seem closely
>> related, but not so much.
>>
>> max_wal_size is all about *checkpoints*. When the WAL exceeds this,
>> Postgres will try to run a checkpoint. Under some circumstances it won't,
>> but let's keep it simple for now.
>>
>> wal_keep_size is all about *replication*. Replicas need WAL files to
>> stick around for long enough that they can process them. wal_keep_size is
>> a minimum figure.
>>
>> Tom
>> On Monday, October 6, 2025 at 03:51:17 PM EDT, Raj <
>> [email protected]> wrote:
>>
>>
>> Should Wal_keep_size <= max_wal_size ?
>>
>
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