On Thu, Jun 15, 2006 at 03:43:09PM -0400, John Vincent wrote: > >Any suggestions? FYI the original question wasn't meant as a poke at > >comparing PG to MySQL to DB2. I'm not making an yvalue judgements either > >way. I'm just trying to understand how we can use it the best way possible. > > > >If anyone from the bizgres team is watching, have they done any work in > >this area? > > > >Thanks. > >John > > > > Actually we just thought about something. With PG, we can create an index > that is a SUM of the column where indexing, no? We're going to test this in > a few hours. Would that be able to be satisfied by an index scan? > > Also, we're looking at the link provided for the materialized views in PG. > > Thanks. decibel=# create index test on i ( sum(i) ); ERROR: cannot use aggregate function in index expression decibel=# BTW, there have been a number of proposals to negate the effect of not having visibility info in indexes. Unfortunately, none of them have come to fruition yet, mostly because it's a very difficult problem to solve. But it is something that the community would like to see happen. -- Jim C. Nasby, Sr. Engineering Consultant jnasby@xxxxxxxxxxxxx Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
