MySQL Forums
Forum List  »  German

Re: Performance bei SELECT
Posted by: Thomas Wiedmann
Date: January 25, 2012 04:49AM

Hallo Mark,

ok. Laut EXPLAIN wird der neue Index scheinbar auch gar nicht verwendet. Die Zeitverbesserung bezieht sich nur auf den verringerte Datenmenge siehe (rows: 37722 vorher 498768) die ich nicht verstehe woher das kommt.

+----+--------------------+--------------+------+---------------+-----------+---------+---------------------------------+--------+----------------------------------------------+
|  1 | PRIMARY            | items        | ALL  | NULL          | NULL      | NULL    | NULL                            |  69093 | Using where; Using temporary; Using filesort |
|  1 | PRIMARY            | <derived3>   | ALL  | NULL          | NULL      | NULL    | NULL                            |  37722 |                                              | <== hier
|  3 | DERIVED            | invoicelines | ALL  | NULL          | NULL      | NULL    | NULL                            | 499560 | Using temporary                              |
|  2 | DEPENDENT SUBQUERY | its          | ref  | ItemNrInt     | ItemNrInt | 4       | pixi_imperial_2.items.ItemNrInt |      8 |                                              |
|----+--------------------+--------------+------+---------------+-----------+---------+---------------------------------+--------+----------------------------------------------+

Hast Du die beiden VARCHAR Spalten auf (80) und (10) verkürzt ?

Grüße
Thomas

Options: ReplyQuote


Subject
Views
Written By
Posted
2602
January 19, 2012 07:17AM
1452
January 19, 2012 12:59PM
1519
January 20, 2012 05:33AM
1735
January 20, 2012 06:10AM
1462
January 20, 2012 07:06AM
1478
January 20, 2012 12:11PM
1438
January 25, 2012 04:11AM
1304
January 25, 2012 04:24AM
1356
January 25, 2012 04:30AM
Re: Performance bei SELECT
1282
January 25, 2012 04:49AM
1118
January 25, 2012 06:05AM
1408
January 25, 2012 06:37AM
1386
January 25, 2012 07:46AM
1457
January 26, 2012 12:57AM
1362
January 25, 2012 11:11PM
1236
January 25, 2012 11:50PM
1141
January 27, 2012 08:27AM
1538
January 27, 2012 06:21AM
1378
February 02, 2012 10:06PM
1085
February 03, 2012 05:34AM
1340
February 03, 2012 02:04PM
1272
February 08, 2012 09:52PM
1318
February 09, 2012 08:41AM
1226
February 10, 2012 02:03AM
1479
February 10, 2012 02:52AM
1372
February 10, 2012 04:51AM
1341
February 09, 2012 11:58PM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.