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help / color / mirror / Atom feedFrom: David G. Johnston <[email protected]>
To: chandan Kumar <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: Review my steps for rollback to restore point
Date: Tue, 4 Mar 2025 08:38:07 -0700
Message-ID: <CAKFQuwbzEDV2e4yfSpr8SkLyxEmAk=WPn3uo3C2q+1xR5VymVA@mail.gmail.com> (raw)
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On Tuesday, March 4, 2025, chandan Kumar <[email protected]> wrote:
> Thank you for your time and clarification.
> Does PITR recreate database internally ? can i say it is not the same as
> pg_restore or it is same as pg_restore plus applying WAL on top of it. I
> am asking because can we revern DDL operations without PITR in streaming
> replication
>
PostgreSQL doesn’t have a concept of “revert”.
PITR just deals with raw bytes on disk for an entire cluster. If a new
file appears in the WAL that file is created. That file can be a directory
for a database.
You cannot mix physical and logical images of the database so applying WAL
on top of pg_restore is technically invalid - but it does effective convey
the idea. It’s like saying pg_dump and pg_basebackup are similar. Sure,
in some ways that is true - but the logical vs. physical distinction cannot
be ignored fully.
David J.
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Subject: Re: Review my steps for rollback to restore point
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