On Mon, Oct 19, 2009 at 8:56 PM, Tom Lane <tgl@xxxxxxxxxxxxx> wrote: > Greg Stark <gsstark@xxxxxxx> writes: >> The run-time of CLUSTER doesn't vary very much based on whether the >> data is already in index order or not. The number of passes only grows >> like log(n) of the size of your data and if you set >> maintenance_work_mem large enough (somewhere around 100MB-1GB) the >> constants are small enough that you're unlikely to even outgrow a >> single pass (plus a final merge though) > > Uh ... what? It's not based on the sort code, unless someone rewrote it > since I looked last. It's an index scan and will definitely depend on > the index ordering. Er, uh, of course. I wonder what I was thinking. Sorry -- greg -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
