Re: Enabling archive_mode without restart

Added to TODO:

Allow archive_mode to be changed without server restart?

* http://archives.postgresql.org/pgsql-hackers/2008-10/msg01655.php

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Simon Riggs wrote:
>
> Currently we enable archive_mode only at server start. The reason for
> this was to protect against people enabling archive_mode half way
> through somebody else running a bulk load without WAL and then having an
> incomplete backup.
>
> All we need to do is this:
>
> * When we change archive_mode to "on" get the next xid and place it in
> xlogctl. When we turn archive_mode "off" clear the value.
>
> * When we run pg_start_backup() check the xid and then wait for all
> transactions to end that can still see that xid before returning.
>
> This means there may be a delay after enabling archive_mode before we
> can run a backup, but normal running will not be interrupted.
>
> It's a fairly small change, touching just guc.c and xlog.c, using same
> code as DefineIndex() to wait.
>
> Objections?
>
> --
> Simon Riggs www.2ndQuadrant.com
> PostgreSQL Training, Services and Support
>
>
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--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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