Re: PITR performance overhead?

In response to "George Pavlov" <gpavlov(at)mynewplace(dot)com>:

> I am looking for some general guidelines on what is the performance
> overhead of enabling point-in-time recovery (archive_command config) on
> an 8.1 database. Obviously it will depend on a multitude of factors, but
> some broad-brush statements and/or anecdotal evidence will suffice.
> Should one worry about its performance implications? Also, what can one
> do to mitigate it?

Prior to implementing PITR, I did some testing to see what kind of
overhead it would add. It was negligible. I don't remember the details,
but I seem to remember the performance hit was barely measurable.

Note that in our usage scenarios, we have very little IO compared to
CPU usage. The result is that our DB servers have plenty of disk
bandwidth to spare. Since the log backup occurs as a background
process, it made almost no difference in our tests. If your DB is
very IO intensive, you may have different results.

--
Bill Moran
Collaborative Fusion Inc.

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