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Re: WAL archiving

From: Shilpa Sudhakar <ssudhakar(at)internode(dot)com(dot)au>
To: Dawid Kuroczko <qnex42(at)gmail(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: WAL archiving
Date: 2008-02-25 04:57:09
Message-ID: 47C24AA5.50405@internode.com.au (view raw or flat)
Thread:
Lists: pgsql-admin
Thanks loads Dawid,

I'll test the process on the TEST box and note down the time it takes.


Dawid Kuroczko wrote:
> On Fri, Feb 22, 2008 at 12:23 AM, Shilpa Sudhakar
> <ssudhakar(at)internode(dot)com(dot)au> wrote:
>   
>>  Since the wal logs keep increasing, do we take the base backup every now
>>  and then so that we can delete the old log files?
>>  How often do we take a base filesystem backup keeping in mind that our
>>  systems are 24 x 7.
>>     
>
> Depends on your workload and needs.
>
> Say, if you have a policy on having ability to "go back in time" for
> at least 30 days, then
> you must keep last base backup that was done before 30 days and all
> the log files since
> then.
>
> But your primary concern should be probably recovery time after
> failure (your whole machine
> just fried ;)).  What you need to do is restore last backup and reply
> all archival WAL logs
> since then.  And assume worst possible situation (the machine fried
> just before full backup),
> for a weekly backups it means 7 days worth of WAL-log reply.
>
> Now, if your database is DML-heavy recovery won't be very fast, so you
> might want to take
> base backups more frequently.  Or better -- set up a standby server
> which will constantly
> reply the backups.
>
>  Regards,
>     Dawid Kuroczko
>
> PS: And before setting a policy, do try test recovery and note down
> how much time it took.
>   


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