Quick Beginnings

Selecting an Instance on OS/2 or Windows NT Systems

On OS/2, Windows 95, or Windows NT Systems:

When starting or stopping a DB2 server instance, the one that is used is determined by the value of DB2INSTANCE. This is determined as follows:

• The current session's environment variables are examined to see if DB2INSTANCE is set. You can set it in a session by issuing the following command at a command prompt:

     set db2instance=new_instance_name
  

• If DB2INSTANCE is not set in the current session, the system environment variables are examined to see if it is set.

  On Windows NT, system environment variables are set in System Environment. On Windows 95, they are set in the autoexec.bat file. On OS/2, they are set in the config.sys file. See "DB2 Registry Values and Environment Variables" for instructions on setting DB2INSTANCE on Windows 95 and Windows NT.

• If DB2INSTANCE is not set by either of the environment variables, then you must use the DB2 Profile Registry value, DB2INSTDEF. It is set at the global level of the registry. For more information on setting it at this level, see "DB2 Registry Values and Environment Variables".

  Note:

  The same search order is used when a client instance is activated by a DB2 call from an application.

To determine which database instance applies in the current session, enter:

   db2set db2instance

On UNIX systems:

To use a specific DB2 instance, you will need to execute the db2profile or db2cshrc file for that instance. You can use the following command to execute db2profile or db2cshrc:

   . INSTHOME/sqllib/db2profile     (in Bourne or Korn shell)
   source INSTHOME/sqllib/db2cshrc  (in C shell)

where INSTHOME is the home directory of the DB2 instance.

To ensure that you are using the correct instance, use the following command: which db2 It will show you the full path name for the DB2 command. This path should include the home directory of the instance.

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