Fix division by zero error.

Fixes zenoss#4.

README.markdown

@@ -15,8 +15,8 @@ Depending on what version of Zenoss you're running you will need a different
 package. Download the appropriate package for your Zenoss version from the list
 below.
 
- * Zenoss 4.1: [Latest Package for Python 2.7][]
- * Zenoss 3.0 - 4.0: [Latest Package for Python 2.6][]
+ * Zenoss 4.1 - 4.2: [Packages for Zenoss 4][]
+ * Zenoss 3.0 - 4.0: [Packages for Zenoss 3][]
 
 Then copy it to your Zenoss server and run the following commands as the zenoss
 user.
@@ -163,6 +163,6 @@ remodeled. This occur once every 12 hours.
 
 
 [Zenoss]: <http://www.zenoss.com/>
-[Latest Package for Python 2.7]: <https://github.com/downloads/zenoss/ZenPacks.zenoss.PostgreSQL/ZenPacks.zenoss.PostgreSQL-1.0.3-py2.7.egg>
-[Latest Package for Python 2.6]: <https://github.com/downloads/zenoss/ZenPacks.zenoss.PostgreSQL/ZenPacks.zenoss.PostgreSQL-1.0.3-py2.6.egg>
+[Packages for Zenoss 4]: <http://zenpacks.zenoss.com/pypi/github/3.2/ZenPacks.zenoss.PostgreSQL/>
+[Packages for Zenoss 3]: <http://zenpacks.zenoss.com/pypi/github/4.2/ZenPacks.zenoss.PostgreSQL/>
 [git repository]: <https://github.com/zenoss/ZenPacks.zenoss.PostgreSQL>

ZenPacks/zenoss/PostgreSQL/util.py

@@ -169,10 +169,14 @@ def getDatabaseStats(self):
 
             for row in cursor.fetchall():
                 xactTotal = row[3] + row[4]
-                xactRollbackPct = (float(row[4]) / xactTotal) * 100
+                xactRollbackPct = 0
+                if xactTotal > 0:
+                    xactRollbackPct = (float(row[4]) / xactTotal) * 100
 
                 tupTotal = row[7] + row[8]
-                tupFetchedPct = (float(row[8]) / tupTotal) * 100
+                tupFetchedPct = 0
+                if tupTotal > 0:
+                    tupFetchedPct = (float(row[8]) / tupTotal) * 100
 
                 databaseStats[row[0]] = dict(
                     size=row[1],

setup.py

@@ -16,7 +16,7 @@
 # or saved.  Do not modify them directly here.
 # NB: PACKAGES is deprecated
 NAME = "ZenPacks.zenoss.PostgreSQL"
-VERSION = "1.0.3"
+VERSION = "1.0.4"
 AUTHOR = "Zenoss"
 LICENSE = ""
 NAMESPACE_PACKAGES = ['ZenPacks', 'ZenPacks.zenoss']