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By default, an Oracle9i
or later instance will look for the SPFILE at startup and then for an instance of the
INIT.ORA file.
The SPFILE can also be kept on a shared disk, so that it can be used to initialize multiple
instances in an Oracle Real Application Clusters configuration.
Starting Up the Database
Starting a database is quite simple??”on Windows you simply start the Oracle services
(or specify that the services are started when the machine boots), and on Unix
and Linux you issue the STARTUP command from SQL*Plus, or through Enterprise
Manager. While starting a database appears to be a single action, it involves an
instance and a database and occurs in several distinct phases. When you start a database,
the following actions are automatically executed:
Shutting Down the Database | 69
1. Starting the instance. Oracle reads the instance initialization parameters from the
SPFILE or INIT.ORA file on the server. Oracle then allocates memory for the
System Global Area and starts the background processes of the instance.


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