I suppose this is my fault for packing so much into a single query, but I really
do want to use tablesort on it.
Here's the query (pager_query with a limit of 20)
SELECT n.nid, n.title, n.status, n.created, n.uid, ra.energy, nc.totalcount,
nc.daycount,
 ppc.totalcount AS printcount, pmc.sentcount, r.realname,
 cs.comment_count, v.value AS votes
 FROM node n
 INNER JOIN realname r ON r.uid=n.uid
 INNER JOIN radioactivity ra ON ra.id=n.nid
 LEFT JOIN node_counter nc ON nc.nid=n.nid
 LEFT JOIN node_comment_statistics cs ON cs.nid=n.nid
 LEFT JOIN votingapi_cache v ON v.content_id=n.nid AND v.function='sum'
 LEFT JOIN print_page_counter ppc ON ppc.path=CONCAT('node/', n.nid)
 LEFT JOIN print_mail_page_counter pmc ON pmc.path=CONCAT('node/', n.nid)
 WHERE n.type = 'blog' AND n.status = 1
 ORDER BY ra.energy DESC
On my test site, this runs really fast - but there are only 6 rows. On the
production site, there are 8,000 nodes and this query takes 35 seconds to run.
EXPLAIN tells me:
id
select_type
table
type
possible_keys
key
key_len
ref
rows
Extra
1 SIMPLE ra ALL PRIMARY NULL NULL NULL 6 Using temporary; Using filesort
1 SIMPLE n eq_ref PRIMARY,node_status_type,node_type,uid PRIMARY 4
drupal6b.ra.id 1 Using where
1 SIMPLE nc eq_ref PRIMARY PRIMARY 4 drupal6b.n.nid 1 Â
1 SIMPLE cs eq_ref PRIMARY PRIMARY 4 drupal6b.ra.id 1 Â
1 SIMPLE v ALL NULL NULL NULL NULL 3729 Â
1 SIMPLE ppc ALL PRIMARY NULL NULL NULL 2738 Â
1 SIMPLE pmc ALL PRIMARY NULL NULL NULL 2745 Â
1 SIMPLE r eq_ref PRIMARY PRIMARY 4 drupal6b.n.uid 1 Using where
With the performance I see, I am not suprised to see "filesort" in there.
Can someone suggest ways to improve the performance?
Nancy