MySQL sql_mode change (#239)

* MySQL sql_mode change

* Fixed formatting

Author: harikrishna-patnala

source/upgrading/upgrade/upgrade_notes.rst

@@ -101,3 +101,23 @@ added in CloudStack's db.properties file:
    db.cloud.driver=jdbc:mysql
 
    db.usage.driver=jdbc:mysql
+
+
+MySQL 8.0 sql mode change
+-------------------------
+
+MySQL mode (sql_mode) has changed in CloudStack db.properties to 
+"STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,
+ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION".
+
+This gets automatically applies to the MySQL session used by CloudStack management server.
+
+If the admin uses MySQL directly and wants to query tables it is advised to change the sql_mode in the corresponding session or globally.
+
+Eg. mysql> set global sql_mode="STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,
+                             "> ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION";
+    Query OK, 0 rows affected (0.00 sec)
+
+    mysql> set sql_mode="STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,
+                     "> ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION";
+    Query OK, 0 rows affected (0.00 sec)