Re: Optimizing Query

Arie Nugraha wrote:

Hi list, I Have a problem with my query that fetch about 22.000 records from database, the query is like this : SELECT SQL_CALC_FOUND_ROWS DISTINCT b.biblio_id, b.title, a.author_name FROMbiblio AS b LEFT JOIN biblio_author AS ba ON b.biblio_id=ba.biblio_id LEFT JOIN mst_author AS a ON ba.author_id=a.author_id WHERE b.biblio_id IS NOT NULL GROUP BY b.biblio_id ORDER BY b.input_date DESC LIMIT 0, 10 it took about 6 seconds to complete the query in localhost. I already make an Indexes on each table, but still the performance is slow. Anyone have an idea how to optimize the query so result is faster?

Why are you doing a distinct AND a group by? You don't need both, just use the DISTINCT. I'm guessing biblio(biblio_id) is a primary key - you don't need: b.biblio_id IS NOT NULL What indexes do you have? You need ones on each field in the joins: biblio(biblio_id) biblio_author(biblio_id, author_id) mst_author(author_id) -- Postgresql & php tutorials http://www.designmagick.com/