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From: Laurenz Albe <[email protected]>
To: Paul Brindusa <[email protected]>
To: pgsql-general <[email protected]>
Subject: Re: Log retention query
Date: Tue, 28 Jan 2025 14:28:36 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAFeSbqjnRXNZ72NdD+G6ScKKBTQXAxpMk=XyH1sPGs+L2atF_A@mail.gmail.com>
References: <CAFeSbqjnRXNZ72NdD+G6ScKKBTQXAxpMk=XyH1sPGs+L2atF_A@mail.gmail.com>

On Tue, 2025-01-28 at 09:57 +0000, Paul Brindusa wrote:
> Good morning everyone,
> 
> Before I get on with today's problem, I would like to say how much I appreciate this community and everything that you do for end users.
> 
> In today's problem I would like to understand if the following lines in our config handle the log rotation for our clusters?
> 
>         log_checkpoints: on
>         logging_collector: on
>         log_truncate_on_rotation: on
>         log_rotation_age: 1d
>         log_rotation_size: 1GB
>         log_error_verbosity: verbose
> 
> I have been deleting the logs manually for the last month, since I am confused how the log collector rotates them. 
> 
> Am looking to delete logs older than 180 days. What are we doing wrong in the config?

It all depends on how you configured "log_filename".

If the setting is "postgresql-%a.log" or "postgresql-%d.log", PostgreSQL
will recycle the old log files once a week or once a month.

If the setting is the default "postgresql-%Y-%m-%d_%H%M%S.log", the same
log file name will never be reused, and there will be no log rotation.

PostgreSQL doesn't actively delete old log files.

Yours,
Laurenz Albe

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