From 04e84a775237791e7539481c458da319f4761012 Mon Sep 17 00:00:00 2001
From: Major Hayden <major@mhtx.net>
Date: Sun, 12 Aug 2007 19:11:35 +0000
Subject: [PATCH] Minor divide by zero error in query cache calculations

---
 mysqltuner.pl | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/mysqltuner.pl b/mysqltuner.pl
index f97ba1c..63ea2f2 100644
--- a/mysqltuner.pl
+++ b/mysqltuner.pl
@@ -284,8 +284,10 @@ sub calculations {
     # Query cache
     if ($mysqlvermajor > 3) {
         $mycalc{'query_cache_efficiency'} = sprintf("%.1f",($mystat{'Qcache_hits'} / ($mystat{'Com_select'} + $mystat{'Qcache_hits'})) * 100);
-        $mycalc{'pct_query_cache_used'} = sprintf("%.1f",100 - ($mystat{'Qcache_free_memory'} / $myvar{'query_cache_size'}) * 100);
-        if ($mystat{'Qcache_lowmem_prunes'} == 0) {
+        if ($myvar{'query_cache_size'}) {
+		$mycalc{'pct_query_cache_used'} = sprintf("%.1f",100 - ($mystat{'Qcache_free_memory'} / $myvar{'query_cache_size'}) * 100);
+        }
+	if ($mystat{'Qcache_lowmem_prunes'} == 0) {
             $mycalc{'query_cache_prunes_per_day'} = 0;
         } else {
             $mycalc{'query_cache_prunes_per_day'} = int($mystat{'Qcache_lowmem_prunes'} / ($mystat{'Uptime'}/86400));
@@ -547,4 +549,4 @@ mysql_stats;                        # Print the server stats
 make_recommendations;               # Make recommendations based on stats
 # ---------------------------------------------------------------------------
 # END 'MAIN'
-# ---------------------------------------------------------------------------
\ No newline at end of file
+# ---------------------------------------------------------------------------