[GENERAL] (Relatively) Oversized Checkpoint

2014-06-16 Thread Nathaniel Talbott
We're still learning to tune PostgreSQL for our production setup, and over the weekend we saw a huge spike in INSERT/UPDATE completion time for a short period which turned out to correlate to an oversized checkpoint. I've included the preceding and following checkpoints for reference points, as the

Re: [GENERAL] (Relatively) Oversized Checkpoint

2014-06-18 Thread Nathaniel Talbott
On Mon, Jun 16, 2014 at 5:01 PM, Jeff Janes wrote: > On Mon, Jun 16, 2014 at 12:40 PM, Nathaniel Talbott > wrote: > >> So the fsync (by the kernel) of a single file took 64 seconds. This > >> single event explains almost all of the overrun and the performance > >&g