Greg Stark escribió: > 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. Your patched version of course. -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc. -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
