Greg Stark escribió: > I think minmax indexes are more akin to bitmap indexes. They will be very > effective for columns with low-cardinality, especially for columns that are > very clustered. In the extreme if all the values in some regions of the > table are the same then minmax indexes would be optimal. I wouldn't expect > them to be very effective for a highly selective column that isn't well > clustered.
I think clustering is more important than cardinality. I mean you can have a very useful minmax index on a float column, on which maybe there are no two identical values. I certainly don't think minmax indexes will solve all indexing problems. In the end, they're just one more tool in your DBA toolbox. -- Álvaro Herrera 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
