Your biggest problem is probably the subquery/IN your are performing.
You should change that to a join. And I don't know about using
SQL_CALC_FOUND_ROWS in a full text query that's not boolean, and you
shouldn't use it unless you have a LIMIT clause.
SELECT SQL_CALC_FOUND_ROWS table_1.id,table_2.*
FROM table_2
JOIN
(SELECT shared_id FROM table_1_view) as table_3 ON
table_2.shared_id=table_3.shared_id
LEFT JOIN table_1 ON table_2.shared_id = table_1.shared_id
WHERE MATCH table_2.field AGAINST ('value')
AND table_2.current = 1
I know the difference doesn't seem that much, but MySQL optimizes it
very differently.
Brent
On Jan 4, 2008, at 5:47 PM, Eben wrote:
Hi,
I have a query that has to run on a full text indexed table with
many millions of records. I'm trying to figure out some
optimizations for it. Here's the general query:
SELECT SQL_CALC_FOUND_ROWS table_1.id,table_2.*
FROM table_2
LEFT JOIN table_1 ON table_2.shared_id = table_1.shared_id
WHERE MATCH table_2.field AGAINST ('value')
AND table_2.current = 1
AND table_2.shared_id IN (SELECT shared_id FROM table_1_view)
Some details:
1. table_1.shared_id and table_2.shared_id are indexed
2. table_2.current is an indexed tinyint
3. table_1_view is derived from a query like:
SELECT shared_id
FROM table_1
WHERE some_field LIKE 'some_value%'
table_1 is a relatively small table i.e. < 100k records
table_2 is massive with > 10 million records
Any ideas or suggestions are appreciated
thanks,
Eben
--
MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe: http://lists.mysql.com/mysql?
[EMAIL PROTECTED]
--
MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
