Re: difficulties with time based queries

"Rainer Mager" <rainer@vanten.com> writes:
>> From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
>> Hmm ... it's pretty unusual to see the index fetch portion of a bitmap
>> scan take the bulk of the runtime.  Usually that part is fast and where
>> the pain comes is in fetching from the heap.   I wonder whether that
>> index has become bloated.  How big are the table and the index
>> physically?  (Look at pg_class.relpages, or if you want a really
>> accurate number try pg_relation_size().)

> Can you give me some more info on how to look at these stats?

Since you've got 8.3 it's easy: select pg_relation_size('tablename')
(or indexname).  The result is in bytes, so you might want to
divide by 1K or 1M to keep the number readable.

            regards, tom lane