Thread: archive_timeout - good indication

Renato Oliveira <renato.oliveira@grant.co.uk> wrote:

> What would be a good indication for  'archive_timeout' on a busy
> server?

The maximum amount of time for which you can tolerate lost
transactions in case you need to use the backup for crash recovery.
Note that you need to balance that need against the space
requirements of the WAL files.  You can mitigate the space problem
by using pg_clearxlogtail or pglesslog.

-Kevin

Kevin,

Thank you for the reply.
I guess 60Sec is a valid option if this is the 'time period' we can tolerate.

PS pg_clearxlogtail I tried to lookup more info about it but could not find much.
With regards to pglesslog I found the site which hosts the project, seems interesting.

My question is does it copy the logs as well as compresses it, because there is an example: archive_command =
'pg_compresslog"%p" /"%f"' 
Is this instead of using 'cp'?

Thank you very much

Best regards

Renato



Renato Oliveira
Systems Administrator
e-mail: renato.oliveira@grant.co.uk

Tel: +44 (0)1763 260811
Fax: +44 (0)1763 262410
http://www.grant.co.uk/

Grant Instruments (Cambridge) Ltd

Company registered in England, registration number 658133

Registered office address:
29 Station Road,
Shepreth,
CAMBS SG8 6GB
UK

-----Original Message-----


From: Kevin Grittner [mailto:Kevin.Grittner@wicourts.gov]
Sent: 09 April 2010 15:22
To: Renato Oliveira; pgsql-admin
Subject: Re: [ADMIN] archive_timeout - good indication

Renato Oliveira <renato.oliveira@grant.co.uk> wrote:

> What would be a good indication for  'archive_timeout' on a busy
> server?

The maximum amount of time for which you can tolerate lost
transactions in case you need to use the backup for crash recovery.
Note that you need to balance that need against the space
requirements of the WAL files.  You can mitigate the space problem
by using pg_clearxlogtail or pglesslog.

-Kevin



-----Original Message-----


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