Note:
These instructions are for 3.5.0 and higher. If you are upgrading from vBulletin 3.0.x to 3.5.0, you will also need to recreate your includes/config.php file based on the new version of includes/config.php.new. Please see this page in the installation section on how to edit the config file. This step is not necessary for individual upgrades within the 3.0.x or 3.5.x series.<br />
If you are upgrading from vBulletin 3.5.x to vBulletin 3.6.x you do not need to edit the config.php file.
If you are upgrading from vBulletin 3.5.x to vBulletin 3.6.x you do not need to edit the config.php file.
wat abt the config details inside .. like database name and all ....
$config['Database']['dbname']This value should be altered to state the name of the database that will contain your vBulletin installation on the database server.$config['Database']['technicalemail']An email address should be entered here. All database error messages will be forwarded to the email address provided.$config['Database']['force_sql_mode']New versions of MySQL (4.1+) have introduced some behaviors that are incompatible with vBulletin. These behaviors are enabled by default with MySQL 5. Setting this value to "true" disables those behaviors. You only need to modify this value if vBulletin recommends it.$config['MasterServer']['servername']This sets the address of your database server. On most installations the database server is located on the same computer as the web server, in which case the address should be set to 'localhost', otherwise use the address of the database server as supplied by your web host.$config['MasterServer']['username']This variable contains the username provided to you by your host for connecting to your database server.$config['MasterServer']['password']The password that accompanies the database username should be entered here.
These instructions are for 3.5.0 and higher. If you are upgrading from vBulletin 3.0.x to 3.5.0, you will also need to recreate your includes/config.php file based on the new version of includes/config.php.new. Please see this page in the installation section on how to edit the config file. This step is not necessary for individual upgrades within the 3.0.x or 3.5.x series.<br />
If you are upgrading from vBulletin 3.5.x to vBulletin 3.6.x you do not need to edit the config.php file.
If you are upgrading from vBulletin 3.5.x to vBulletin 3.6.x you do not need to edit the config.php file.

$config['Database']['dbname']This value should be altered to state the name of the database that will contain your vBulletin installation on the database server.$config['Database']['technicalemail']An email address should be entered here. All database error messages will be forwarded to the email address provided.$config['Database']['force_sql_mode']New versions of MySQL (4.1+) have introduced some behaviors that are incompatible with vBulletin. These behaviors are enabled by default with MySQL 5. Setting this value to "true" disables those behaviors. You only need to modify this value if vBulletin recommends it.$config['MasterServer']['servername']This sets the address of your database server. On most installations the database server is located on the same computer as the web server, in which case the address should be set to 'localhost', otherwise use the address of the database server as supplied by your web host.$config['MasterServer']['username']This variable contains the username provided to you by your host for connecting to your database server.$config['MasterServer']['password']The password that accompanies the database username should be entered here.
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