Re: Huge table searching optimization - Mailing list pgsql-performance

Andres Freund <andres@anarazel.de> writes:
> On Monday 05 April 2010 16:28:35 Oliver Kindernay wrote:
>> i am using this request:
>> select url from test2 where url ~* '^URLVALUE\\s*$';

> Depending on your locale it might be sensible to create a text_pattern_ops
> index - see the following link:
> http://www.postgresql.org/docs/current/static/indexes-opclass.html

text_pattern_ops won't help for a case-insensitive search.  The best bet
here would be to index on a case-folded, blank-removed version of the
url, viz

    create index ... on (normalize(url))

    select ... where normalize(url) = normalize('URLVALUE')

where normalize() is a suitably defined function.

Or if it's okay to only store the normalized form of the string,
you could simplify that a bit.

            regards, tom lane