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Re: PITR Backups

From: "Simon Riggs" <simon(at)2ndquadrant(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "Dan Gorman" <dgorman(at)hi5(dot)com>,"Koichi Suzuki" <suzuki(dot)koichi(at)oss(dot)ntt(dot)co(dot)jp>,"Toru SHIMOGAKI" <shimogaki(dot)toru(at)oss(dot)ntt(dot)co(dot)jp>,<pgsql-performance(at)postgresql(dot)org>
Subject: Re: PITR Backups
Date: 2007-06-25 16:56:06
Message-ID: 1182790567.9276.609.camel@silverbirch.site (view raw or flat)
Thread:
Lists: pgsql-performance
On Mon, 2007-06-25 at 12:34 -0400, Tom Lane wrote:
> Dan Gorman <dgorman(at)hi5(dot)com> writes:
> > Jun 21 00:39:43 sfmedstorageha001 postgres[3506]: [9-1] 2007-06-21  
> > 00:39:43 PDTLOG:  redo done at 71/99870670

This is mid-way through an xlog file.

> > Jun 21 00:39:43 sfmedstorageha001 postgres[3506]: [10-1] 2007-06-21  
> > 00:39:43 PDTWARNING:  page 28905 of relation 1663/16384/76718 was  
> > uninitialized
> > ... lots of these ...
> > Jun 21 00:39:43 sfmedstorageha001 postgres[3506]: [40-1] 2007-06-21  
> > 00:39:43 PDTPANIC:  WAL contains references to invalid pages
> 
> (BTW, you'll find putting a space at the end of log_line_prefix
> does wonders for log readability.)
> 
> Reformatting and sorting, we have
> 
> WARNING: page 28900 of relation 1663/16384/76718 was uninitialized
> WARNING: page 28902 of relation 1663/16384/76718 was uninitialized

> WARNING: page 26706 of relation 1663/16384/76719 was uninitialized
> WARNING: page 26708 of relation 1663/16384/76719 was uninitialized

Those two are interesting because we appear to have two valid pages in
the middle of some uninitialized ones. That implies were not looking at
an unapplied truncation.

-- 
  Simon Riggs             
  EnterpriseDB   http://www.enterprisedb.com



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