On Tue, Jun 14, 2011 at 7:28 PM, Bruce Momjian <br...@momjian.us> wrote: > Simon Riggs wrote: >> Currently, the planner and executor are mostly independent of each >> other: the planner doesn't really know when the plan will be executed, >> and the executor doesn't know how recently the plan was made. >> >> We can work out the various paths through the traffic cop to see when >> a plan will be a "one-shot" - planned and then executed immediately, >> then discarded. > > I was also hoping someday allow plans that are to be immediately > executed to probe the buffer cache to determine how expensive index > scans would be.
Yes, it opens up many optimizations, both for cache sensitivity and dynamic data access. But those are later ideas based on the existence of this first step. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
