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Improve DB queries 

* WHERE IN clauses perform really bad for long lists/sub-queries
* Using INNER JOINs to speed up the queries
* Down from a couple of minutes to less than a second :-)
This commit is contained in:
Oliver Bock 2016-03-04 14:42:41 +00:00 committed by Christian Beer
parent 407a2fce47
commit fd3e17b04c
1 changed files with 2 additions and 2 deletions
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4
html/inc/util_ops.inc
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@ -359,8 +359,8 @@ if (!isset($skip_auth_ops) && array_key_exists("SERVER_PORT", $_SERVER)) {
//
function cancel_wus_where($clause) {
$q1 = "CREATE TEMPORARY TABLE tmp SELECT id FROM workunit WHERE $clause;";
$q2 = "UPDATE result SET server_state=5, outcome=5 WHERE server_state=2 AND workunitid in (SELECT id FROM tmp);";
$q3 = "UPDATE workunit SET error_mask=error_mask|16, transition_time=0 WHERE id in (SELECT id FROM tmp);";
$q2 = "UPDATE result r INNER JOIN tmp t on r.workunitid=t.id SET server_state=5, outcome=5 WHERE server_state=2;";
$q3 = "UPDATE workunit w INNER JOIN tmp t on w.id=t.id SET error_mask=error_mask|16, transition_time=0;";
$q4 = "DROP TABLE tmp;";
if (!_mysql_query($q1)) {