Each time you install Oracle products into a new Oracle home on your computer, HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\KEY_HOMENAME is created.

This subkey contains parameter values for most Oracle products.

HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\KEY_HOMENAME includes the following parameters for an Oracle home directory. Depending on products you install, additional parameters can also be created. See your Windows development manuals.

• MSHELP_TOOLS
  Specifies the location of Windows help files.
• NLS_LANG and Other Globalization Parameters
  Specifies supported language, territory, and character set.
• ORA_CWD
  Specifies current working directory.
• ORA_SID_AUTOSTART
  Starts Oracle Database when OracleServiceSID service is started.
• ORA_SID_PFILE
  Specifies full path to initialization parameter file.
• ORA_SID_SHUTDOWN
  When set to true, the default value, this parameter shuts down the instance of Oracle Database identified by SID when OracleServiceSID is stopped manually—using either the Control Panel or Net stop command.
• ORA_SID_SHUTDOWN_TIMEOUT
  Sets maximum time (in seconds) to wait for shutdown to complete before the service for a particular SID stops.
• ORA_SID_SHUTDOWNTYPE
  Specifies mode in which Oracle Database is shut down when you stop OracleServiceSID.
• ORA_TZFILE
  Specifies the location of time zone file.
• ORACLE_AFFINITY
  Enables the scheduling of class threads on more than one processor group for systems with more than 64 CPUs.
• ORACLE_BASE
  Specifies the top-level Oracle directory (for example, C:\app\username\product\12.2.0) that contains ORACLE_HOME, admin, and oradata.
• ORACLE_GROUP_NAME
  Specifies the name of the group containing icons of the Oracle products installed.
• ORACLE_HOME
  Specifies Oracle home directory in which Oracle products are installed.
• ORACLE_HOME_KEY
  The HKEY_LOCAL_MACHINE location of Oracle parameters.
• ORACLE_HOME_USER
  A string type entry that holds the Oracle Home User value.
• ORACLE_HOMENAME
  Specifies home name of Oracle home directory in which Oracle products are installed.
• ORACLE_PRRITY
  Determines Windows scheduling priorities of the threads within the Oracle Database management system process.
• ORACLE_SID
  Specifies the name of the Oracle Database instance on the host computer.
• OSAUTH_PREFIX_DOMAIN
  Enables user authentication.
• RDBMS_ARCHIVE
  Specifies the location of backup database files.
• RDBMS_CONTROL
  Specifies the location of backup database control files.
• SQLPATH
  Specifies the location of SQL scripts.