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Automatic Startup and Shutdown
On UNIX, several files and scripts in different directories are used to start an instance automatically. Other scripts are run on computer shutdown, allowing applications such as Oracle to shut down cleanly.

For automatic startup on Windows, set registry parameter ORA_SID_AUTOSTART to true using an Oracle tool such as ORADIM. Enter the following with parameters at the command prompt:
C:\> oradim parameters

To start the listener automatically, set services startup type to automatic.

For automatic shutdown on Windows, set registry parameters ORA_SHUTDOWN and ORA_SID_SHUTDOWN to stop the relevant OracleServiceSID and shut down. Set registry parameter ORA_SID_SHUTDOWNTYPE to control shutdown mode (default is i, or immediate).

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ALSO

Setting Registry Parameters
To start or stop an Oracle9i database through Oracle Services, set the following registry parameters to the indicated values:

ORA_SID_AUTOSTART

When set to true, the default value, this parameter causes Oracle9i database to start when OracleServiceSID is started.

ORA_SID_PFILE

This parameter sets the full path to the initialization parameter file. The default path is ORACLE_BASE\ADMIN\db_name\pfile\init.ora

ORA_SHUTDOWN

When set to true, this parameter enables the selected Oracle9i database to be shut down when OracleServiceSID is stopped. This includes any database in the current Oracle home. Default value is false.

ORA_SID_SHUTDOWN

When set to true, this parameter causes the Oracle9i database identified by the SID value to shut down when OracleServiceSID is stopped. Default value is false.