[development] Drupal.org slow queries analyzed with explain: CVS tables

Kieran Lal kieran at civicspacelabs.org
Mon Jul 31 21:57:22 UTC 2006

On Jul 30, 2006, at 9:41 PM, Kieran Lal wrote:

> mysql> EXPLAIN SELECT DISTINCT m.*, r.*, u.name, u.uid FROM  
> cvs_messages m  INNER JOIN cvs_repositories r ON m.rid = r.rid  
> INNER JOIN users u ON m.uid = u.uid  ORDER BY m.created

Here's what I think is happening.

cvs_messages has 25K rows and is joining on cvs_repositories which  
has two rows, one for core and one for contrib.

Then that is joined against users table which has approximately 80K  

25K joined on 2 joined on 80K.   I am wondering if we can just get  
the values from the cvs_repositories into a PHP array and then join  
cvs_messages to users on uid.  Any ideas would be welcome.

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