Issuing commands and running utilities
You can control most operations by using DB2 commands, and you can perform maintenance tasks by using DB2 utilities.
DB2 commands
You can enter commands at a workstation, at a z/OS console, or through an authorized program facility (APF) authorized program or application that uses the instrumentation facility interface (IFI).
To enter a DB2 command from an authorized z/OS console, use a subsystem command prefix (composed of one to eight characters) at the beginning of the command. The default subsystem command prefix is -DSN1, which you can change when you install or migrate DB2. 
Example: The following command ...
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