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help / color / mirror / Atom feedFrom: Tom Lane <[email protected]>
To: Scott Ribe <[email protected]>
Cc: Pgsql-admin <[email protected]>
Subject: Re: measuring WAL creation
Date: Fri, 02 Aug 2024 16:29:19 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
Scott Ribe <[email protected]> writes:
> I'd like to measure both the amount of WAL created by a long series of data modifications and the compressed size of the generated WAL files.
> I suppose I need to set wal_keep_size high, and pay attention to segment numbers to make sure it was high enough. Then I can look at segments created while the commands were running.
> But question: can I simply delete all WAL after a clean shutdown?
As a general rule, never do that manually --- the risk/reward ratio is
unattractive. A checkpoint will release all safely-releasable WAL.
You can checkpoint via a shutdown if you insist, but a plain
CHECKPOINT command should be enough.
regards, tom lane
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