From c4c0b5a4e9d407f438c4583996cd690fddb72ad8 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 d6e77d2fabd..49733872740 100644
--- a/lib/completion/cron.php
+++ b/lib/completion/cron.php
@@ -382,10 +382,11 @@ function completion_cron_completions() {
         SET
             reaggregate = 0
         WHERE
-            reaggregate < {$timestarted}
+            reaggregate < :timestarted
+        AND reaggregate > 0
     ";
 
-    $DB->execute($sql);
+    $DB->execute($sql, array('timestarted' => $timestarted));
 }
 
 /**