Re: Is this expected? (Index scanning)
Mitch Vincent <mitch@venux.net>
From: "Mitch Vincent" <mitch@venux.net>
To: "Stephan Szabo" <sszabo@megazone23.bigpanda.com>
Cc: <pgsql-general@postgresql.org>
Date: 2001-05-07T03:45:27Z
Lists: pgsql-general
> In the first and last case the like is anchored at the beginning so it > uses the name index. The middle case can't use that index, and how > well distributed are the values of void (is it a boolean?)? Ahh... I thought that the middle case could use an index, I guess that's why I was confused.. >It's likely > that the index isn't very selective, if most of the rows are void='f' > then that index is probably more expensive to scan than the sequence scan > would be. Yep, most of the rows are void='f'.. Thanks!! -Mitch