I have a table with over 1MM records and 15 columns. I had created a "unique index" on a mix of two columns to enforce a constraint : (resource_type_id, lower(archive_pathname)) i've noticed that searches never use this. no matter what I query, even if it's only the columns in the index. I'm seeing a 550ms sequential scan on everything. If I create an index only on the text field: lower(archive_pathname) , all the queries use that and complete in 1.4ms does anyone know why this happens ? -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
