On Thu, Jun 10, 2010 at 3:34 PM, Mike Christensen <mike@kitchenpc.com> wrote:
> From this site:
>
> http://developer.postgresql.org/pgdocs/postgres/citext.html
>
> I couldn't tell if you still had to create an index on the lower case
> value. It seems that it basically mimics the WHERE LOWER(email) =
> LOWER(?) method. Since this part is incredibly performance critical,
> maybe I'm better off storing my data all in lowercase and keeping the
> DB case sensitive.
of course you'd still need an index. whether you store it lower case
in regular text or mixed case in a citext, the db would need an index
for good performance. But you wouldn't have to store a lower() index
for citext, just an index.
BTW, citext it new for 8.4, so it's probably not an option for you if
you're on 8.3
