Re: Wal_keep_size

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On Tue, 7 Oct 2025, 10:22 Raj, <rajeshkumar(dot)dba09(at)gmail(dot)com> 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, <tomfecarroll(at)yahoo(dot)com> 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 <
>> rajeshkumar(dot)dba09(at)gmail(dot)com> wrote:
>>
>>
>> Should Wal_keep_size <= max_wal_size ?
>>
>