Last modified: 2012-08-26 09:36:06 UTC

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Bug 13577 - Optimize query in Special Unusedcategories & Special Mostlinkedcategories by using category table
Optimize query in Special Unusedcategories & Special Mostlinkedcategories by ...
Status: NEW
Product: MediaWiki
Classification: Unclassified
Special pages (Other open bugs)
All All
: Low enhancement (vote)
: ---
Assigned To: Nobody - You can work on this!
: patch, patch-reviewed
Depends on:
Blocks: 13326 39661
  Show dependency treegraph
Reported: 2008-04-01 12:45 UTC by Nicolas Dumazet
Modified: 2012-08-26 09:36 UTC (History)
4 users (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---

proposed patch (1.77 KB, patch)
2008-04-01 12:45 UTC, Nicolas Dumazet

Description Nicolas Dumazet 2008-04-01 12:45:56 UTC
Created attachment 4781 [details]
proposed patch

Special:UnusedCategories && Special:MostLinkedCategories could benefit from the new "cat_pages" field from the new category table.

A patch modifying the SQL queries to use it is included : local testing, after a proper populateCategory.php, seemed successful.

I assumed that with that new indexed field, MostLinkedCategories was no more an expensive query : Please double-check me on this.

Comment 1 Brion Vibber 2008-04-07 22:55:55 UTC
Per IRC discussion; as written this may not work correctly for UnusedCategories, as there may not be a category table entry.

For MostLinkedCategories this should work perfectly, though!
Comment 2 Sam Reed (reedy) 2011-11-20 14:51:00 UTC
Special:MostLinkedCategories patch updated and applied in r103759
Comment 3 Sam Reed (reedy) 2011-11-20 14:53:08 UTC
Comment on attachment 4781 [details]
proposed patch

Marking obsolete as patch half applied, and other half is wrong

Not sure how much brions statement is still true...

On enwiki:

mysql> explain select cat_title from category where cat_pages = 0;
| id | select_type | table    | type | possible_keys | key       | key_len | ref   | rows   | Extra |
|  1 | SIMPLE      | category | ref  | cat_pages     | cat_pages | 4       | const | 728557 |       |
1 row in set (0.00 sec)

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