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Re: PITR Backups

From: Dan Gorman <dgorman(at)hi5(dot)com>
To: Simon Riggs <simon(at)2ndquadrant(dot)com>
Cc: "Toru SHIMOGAKI" <shimogaki(dot)toru(at)oss(dot)ntt(dot)co(dot)jp>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, <pgsql-performance(at)postgresql(dot)org>
Subject: Re: PITR Backups
Date: 2007-06-22 11:51:19
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Ah okay. I understand now. So how can I signal postgres I'm about to  
take a backup ? (read doc from previous email ? )

Dan Gorman

On Jun 22, 2007, at 4:38 AM, Simon Riggs wrote:

> On Fri, 2007-06-22 at 04:10 -0700, Dan Gorman wrote:
>> This snapshot is done at the LUN (filer) level, postgres is un-aware
>> we're creating a backup, so I'm not sure how pg_start_backup() plays
>> into this ...
> Postgres *is* completely unaware that you intend to take a backup,  
> that
> is *exactly* why you must tell the server you intend to make a backup,
> using pg_start_backup() and pg_stop_backup(). That way Postgres will
> flush its buffers, so that they are present on storage when you  
> make the
> backup.
> Is the procedure for Oracle or any other transactional RDBMS any
> different?
> -- 
>   Simon Riggs
>   EnterpriseDB
> ---------------------------(end of  
> broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
>        choose an index scan if your joining column's datatypes do not
>        match

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