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Performance fix for FriendFeed sup interface: MySQL query optimizer was doing a table scan on notice; explicit subquery makes it run much more efficiently, only scanning items within the period under consideration. Standard subquery should be PostgreSQL-compatible.

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Brion Vibber 2010-02-21 15:21:18 -08:00
parent 5253a99d7a
commit f6ebe81538
1 changed files with 3 additions and 1 deletions
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4
actions/sup.php
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@ -66,10 +66,12 @@ class SupAction extends Action
$divider = common_sql_date(time() - $seconds); $divider = common_sql_date(time() - $seconds);
$notice->query('SELECT profile_id, max(id) AS max_id ' . $notice->query('SELECT profile_id, max(id) AS max_id ' .
'FROM notice ' . 'FROM ( ' .
'SELECT profile_id, id FROM notice ' .
((common_config('db','type') == 'pgsql') ? ((common_config('db','type') == 'pgsql') ?
'WHERE extract(epoch from created) > (extract(epoch from now()) - ' . $seconds . ') ' : 'WHERE extract(epoch from created) > (extract(epoch from now()) - ' . $seconds . ') ' :
'WHERE created > "'.$divider.'" ' ) . 'WHERE created > "'.$divider.'" ' ) .
') AS latest ' .
'GROUP BY profile_id'); 'GROUP BY profile_id');
$updates = array(); $updates = array();