The global database name for an Oracle RAC database must meet the naming requirements. The global database name consists of the database name and the domain name.

1. Choose a name for your database that has the following characteristics:
   1. Up to 30 characters in length
   2. Begins with an alphabetic character
2. Determine the domain name portion of the global database name, that satisfies these requirements:
   1. Is up to 128 characters in length
   2. Contains only alphabetic and numeric characters, and the period (.) character
3. Determine the ORACLE_SID values for each instance.
   The maximum number of characters you can use for the SID prefix is 8 characters. Oracle Database Configuration Assistant uses the SID prefix to generate a unique value for the variable ORACLE_SID for each instance. The SID prefix must begin with an alphabetic character.