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)
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