Skip site navigation (1) Skip section navigation (2)

Re: archived WALL files question

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Frederiko Costa" <frederiko(at)gmail(dot)com>
Cc: <pgsql-admin(at)postgresql(dot)org>
Subject: Re: archived WALL files question
Date: 2010-04-19 18:41:43
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
Frederiko Costa <frederiko(at)gmail(dot)com> wrote:
> log files are being copied directly to the /mnt/data dir.
> However, the same segments are not in the pg_xlog 
> dir. Is this a default behaviour?
Yes, the pg_xlog directory tries to keep a set of files ready to
receive WAL, and to hold it until the next checkpoint completes,
while the archive directory holds WAL files which have filled or
reached the archive_timeout limit.  There can be some overlap, but
basically you can view the archive as "past" and pg_xlog as
"future", with some potential overlap in "the present".
> Must I set archive_timeout?
No, but once a database write occurs, you don't have it backed up
until the WAL file is written to the archive directory. 
archive_timeout is for those who want some wall-clock bounds on how
much they can lose in, say, a drive failure.  If the database can be
reloaded from some other source, or the data has no real value, it
may not pay to use this feature.

In response to

pgsql-admin by date

Next:From: Josh KupershmidtDate: 2010-04-20 01:24:40
Subject: Re: How to disconnect a single user in Postgresql 8.2.5 from a database
Previous:From: Frederiko CostaDate: 2010-04-19 17:49:51
Subject: Re: archived WALL files question

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group