Pat Maddox wrote: > I’ve been asked to help with a project dealing with slow queries. I’m brand > new to the project, so I > have very little context. I’ve gathered as much information as I can. > > I’ve put the schema, query, and explain info in gists to maintain their > formatting. > > We are stumped with this slow query right now. I could really use some help > looking for ways to speed > it up.
I don't know if the plan can be improved; it has to retrieve and sort 347014 rows, most of which are read from diak, so it will take some time. One thing I notice is that some statistics seem to be bad (the estimate for the index scan on "permissions" is off the mark), so maybe you can ANALYZE both tables (perhaps with higher "default_statistics_target") and see if that changes anything. Is there any chance you could give the machine lots of RAM? That would speed up the bitmap heap scan (but not the sort). Yours, Laurenz Albe -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
