David,
> I've seen these messages in the log before, and am aware of the need to
> increase checkpoint_segments, but I wasn't aware that recycling a
> transaction log could be that damaging to performance. There may have
> been some local hiccup in this case, but I'm wondering if recycling is
> known to be a big hit in general, and if I should strive to tune so that
> it never happens (if that's possible)?
Yes, and yes. Simply allocating more checkpoint segments (which can eat a
lot of disk space -- requirements are 16mb*(2 * segments +1) ) will prevent
this problem.
--
Josh Berkus
Aglio Database Solutions
San Francisco