On Fri, Oct 7, 2011 at 11:40 AM, Tom Lane <t...@sss.pgh.pa.us> wrote: > Robert Haas <robertmh...@gmail.com> writes: >> Please find attached a patch implementing a basic version of >> index-only scans. > > I'm making some progress with this, but I notice what seems like a > missing feature: there needs to be a way to turn it off. Otherwise > performance comparisons will be difficult to impossible. > > The most obvious solution is a planner control GUC, perhaps > "enable_indexonlyscan". Anyone object, or want to bikeshed the name? >
Currently I can't force an indexonlyscan over an indexscan, because of the way the enable_* variables work. Should setting enable_indexscan=off also disable index-only scans (the current behavior) in addition to plain index scans? By way of precedent, enable_indexscan=off does not disable Bitmap Index Scan. Cheers, Jeff -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
