WAL log archive frequency - Mailing list pgsql-admin

From Chris Jewell
Subject WAL log archive frequency
Date
Msg-id 43CF6D93.2080806@lancaster.ac.uk
Whole thread Raw
Responses Re: WAL log archive frequency  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-admin
Hi,

Further to my question on PITR, I have now implemented it :-)  However,
I was wondering about the frequency of archiving the WAL.  Does
postgresql wait until the current WAL file has reached 16MB before
calling the archive_command?  The reason why I ask is that last night,
after doing the base backup, I noticed that a WAL file had been written
to my backup server.  This morning, I added a primary key to a table but
noticed that nothing was written to the backup server.  Should it have
been?

Is there any method of forcing a WAL segment to be archived at a given
frequency irrespective of whether or not it is a full 16MB?  Our
database changes so infrequently at the moment that I'm worried that
these small changes may not be backed up regularly by the PITR system.

Thanks,

Chris
--
Chris Jewell, BSc(Hons), BVSc, MRCVS
Dept of Maths and Statistics
Fylde College
Lancaster University
Lancaster
Lancs
LA1 4YF

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