I ammend my previous post.
Paul Nowosielski wrote:
Dear All,
I've been hashing out this query for awhile with no luck as of yet.
Basically the query works if I put a limit of 500 or so but when I do the full
query it takes up so many resource that the database engine is useless.
Here is the query:
SELECT DISTINCT (td.td_id) ,td.venue_id as ven_id, td.td_date as td_date,
art.NAME as art_name,art.WEB as art_url, artd.artist_id as art_id, tv.ID,
tv.NAME as ven_name, tv.ADDR1 ven_add0, tv.ADDR2 as ven_add1,tv.CITY
ven_city,tv.STATE ven_state, tv.ZIPCODE ven_zip,tv.COUNTRY ,tv.WEBSITE as
ven_url,tvc.SIZE as capacity,
tvage.TYPE as age,tv.TICKETAGNCY1 as tix0, tv.TICKETAGNCY2 as tix1
FROM tourdates td, tbl_ARTST as art, artist_tourdate artd , tbl_VENUES tv,
tbl_VENUE_CAPACITY tvc
,tbl_VENUE_AGE_XREF tvax, tbl_VENUE_AGES tvage
Use INNER_JOIN and use ON clauses. tvc, tvax, and tvage are not joined
at all, producing Cartesian Products.
LEFT JOIN tbl_VENUE_CAPACITY ON (tv.ID=tvc.VENUE_ID)
This on condition does not include the table being joined.
LEFT JOIN tbl_VENUE_AGE_XREF ON (tv.ID=tvax.VENUE_ID)
This on condition does not include the table being joined.
LEFT JOIN tbl_VENUE_AGES ON (tvax.VENUE_ID = tvage.PKEY)
This on condition does not include the table being joined.
WHERE
td_date > NOW() AND (td.td_id = artd.td_id AND artd.artist_id = art.PKEY AND
td.venue_id=tv.ID) LIMIT 500
Here is a description of the query:
+--------------------+--------+-----------------------+---------+---------+----------------+-------+------------------------------+
| table | type | possible_keys | key | key_len |
ref | rows | Extra |
+--------------------+--------+-----------------------+---------+---------+----------------+-------+------------------------------+
| td | range | PRIMARY,idx01,dateidx | dateidx | 4 |
NULL | 43943 | Using where; Using temporary |
| artd | ref | idx01,idx02 | idx01 | 4 |
td.td_id | 1 | |
| art | eq_ref | PRIMARY,idx02 | PRIMARY | 4 |
artd.artist_id | 1 | Using where |
| tv | eq_ref | PRIMARY,idx04 | PRIMARY | 4 |
td.venue_id | 1 | Using where |
| tvage | ALL | NULL | NULL | NULL |
NULL | 4 | |
| tvc | ALL | NULL | NULL | NULL |
NULL | 10261 | |
| tbl_VENUE_CAPACITY | index | NULL | idx01 | 5 |
NULL | 10261 | Using index; Distinct |
| tvax | index | NULL | idx01 | 8 |
NULL | 11616 | Using index; Distinct |
| tbl_VENUE_AGE_XREF | index | NULL | idx01 | 8 |
NULL | 11616 | Using index; Distinct |
| tbl_VENUE_AGES | index | NULL | PRIMARY | 4 |
NULL | 4 | Using index; Distinct |
+--------------------+--------+-----------------------+---------+---------+----------------+-------+------------------------
I need to be able to run the full query on a daily basis without killing the
DB engine.
The query needs to pull in about 50,000 results.
Does anyone see a way to optimize this query or rewrite it so it doesn't cause
a huge system load?
Thank you,
--
Gerald L. Clark
Supplier Systems Corporation
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