From: | "Florian G(dot) Pflug" <fgp(at)phlo(dot)org> |
---|---|
To: | Albe Laurenz <all(at)adv(dot)magwien(dot)gv(dot)at> |
Cc: | Tim Allen *EXTERN* <tim(at)proximity(dot)com(dot)au>, pgsql-hackers(at)postgresql(dot)org, Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-patches(at)postgresql(dot)org |
Subject: | Re: [HACKERS] Forcing current WAL file to be archived |
Date: | 2006-08-01 08:48:20 |
Message-ID: | 44CF1554.8060604@phlo.org |
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Lists: | pgsql-hackers pgsql-patches |
Albe Laurenz wrote:
> Tim Allen wrote:
>>>> Patch included to implement xlog switching, using an xlog record
>>>> "processing instruction" and forcibly moving xlog pointers.
>>>>
>>>> 1. Happens automatically on pg_stop_backup()
>>>
>>> Oh - so it will not be possible to do an online backup
>>> _without_ forcing a WAL switch any more?
>> Well, previously, you would have always had to simulate a wal
>> switch, by
>> working out which is the current wal file and copying that. Otherwise
>> your online backup wouldn't be complete.
>>
>> What Simon is describing sounds like a big step forward from that
>> situation. It should let me delete half the code in my pitr
>> backup/failover scripts. Definitely a Good Thing.
>
> Certainly a Good Thing, and it should be on by default.
>
> But couldn't there be situations where you'd like to do an
> online backup without a WAL switch? To avoid generating an
> archive WAL every day on a database with few changes, e.g.?
But the online backup would be impossible to restore, if you don't
have enough wal archived to recover past the point where you called
pg_stop_backup().
So, doing a wal switch when pg_stop_backup() is called greatly reduces
the risk of a user error that leads to broken backups.
greetings, Florian Pflug
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