Tom Lane <t...@sss.pgh.pa.us> wrote: > "Todd A. Cook" <tc...@blackducksoftware.com> writes: >> I've noticed that on 8.4.0, commits can take a long time when a >> temp table is repeatedly filled and truncated within a loop. > The commit time doesn't seem tremendously out of line, but it looks > like there's something O(N^2)-ish in the function execution. Do > you see a similar pattern? With so many temp files there could well > be some blame on the kernel side. (This is a Fedora 10 box.) This sounds very similar to my experience here: http://archives.postgresql.org/pgsql-hackers/2008-11/msg01472.php Depending on what sort of RAID controller caching is present, a BBU cache might be containing the problem up to some threshold. Perhaps it's not so much O(N^2) as O(N)-<someconstant>, with a min of zero? -Kevin
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