From 48bdd5217261e6bb3a8b4a4296bcd1da13250a3e Mon Sep 17 00:00:00 2001
From: Aaron Barnes <aaronb@catalyst.net.nz>
Date: Sat, 16 Jun 2012 22:47:48 +1200
Subject: [PATCH] MDL-33788 completion: SQL optimisation

---
 lib/completion/cron.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/completion/cron.php b/lib/completion/cron.php
index 3645c0618d6..bf2a646accf 100644
--- a/lib/completion/cron.php
+++ b/lib/completion/cron.php
@@ -377,10 +377,11 @@ function completion_cron_completions() {
         SET
             reaggregate = 0
         WHERE
-            reaggregate < {$timestarted}
+            reaggregate < :timestarted
+        AND reaggregate > 0
     ";
 
-    $DB->execute($sql);
+    $DB->execute($sql, array('timestarted' => $timestarted));
 }
 
 /**