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Commands in the DB2 environment are divided into the following categories:

  • The DSN command and its subcommands

  • DB2 commands

  • IMS commands

  • CICS Attachment Facility Commands

  • MVS IRLM commands


This chapter considers only the DSN commands and the DB2 commands.

DSN Commands

DSN, the DB2 command processor, executes as a TSO command. All subcommands except SPUFI run under DSN in either the foreground or the background. All subcommands except END also run under DB2 Interactive (DB2I). SPUFI runs only in the foreground under ISPF. The DSN commands/subcommands and their functions are listed in Table 2-2.

Table 2-2. DSN Commands/Subcommands




Causes the DSN session to terminate with an X'04E'


Builds an application package or plan

DB2 command

Executes a DB2 command

DCLGEN (declarations generator)

Produces declarations for tables or views


Starts a DSN session


Ends a DSN session


Deletes an application package or plan


Updates an application package or plan


Updates an application trigger package


Executes an application program


Executes the SQL processor using file input



DB2 Commands

The command START DB2 can be issued only from a z/OS console or Authorized Program Facility (APF) passing it to the console. All other DB2 commands can be issued from the following:

  • APF authorized program

  • CICS terminal

  • DB2I panel

  • IFI application program

  • IMS terminal

  • TSO terminal session

  • z/OS console or z/OS application program

An application program may use the DB2 Instrumentation Facility Interface to issue DB2 commands. DB2 commands issued from an MVS console are not associated with any secondary authorization IDs. The DB2 commands and their functions are listed in Table 2-3.

Table 2-3. DB2 Commands




Alters attributes for the buffer pools


Alters attributes for the group buffer pools


Alters parameter values of the REORG utility


Enables a site to close a current active log and open the next available log data set


Cancels processing for specific local or distributed threads


Displays information about archive-log processing


Displays information about the buffer pools


Displays status information about DB2 databases


Displays information regarding the status and configuration of the DDF


Displays statistics about external user-defined functions


Displays information about the data sharing group to which a DB2 subsystem belongs and which mode DB2 is operating in


Displays status information about DB2 group buffer pools


Displays status information about distributed threads


Displays log information and status of the offload task


Displays status information about stored procedures


Displays status information about the resource limit facility (governor)


Displays information about DB2 threads


Displays information about DB2 traces


Displays status information about a DB2 utility


Changes the trace events associated with a particular active trace


Reestablishes dual-bootstrap data sets


Recovers threads left in doubt


Completes backout processing for units of recovery left incomplete during an earlier restart


Purges information stored by VTAM in the coupling facility


Purges information displayed in the in-doubt thread report generated by the –DISPLAY THREAD command


Controls the allocation of tape units and the deallocation time of the tape units for archive-log processing


Modifies the checkpoint frequency


Loads the subsystem parameters specified in the command


Makes the specified database available for use


Initializes the DB2 subsystem; can be issued only from an MVS console


Starts the Distributed Data Facility


Activates a stopped external function


Activates the definition of stopped or cached stored procedures


Starts the resource limit facility (governor)


Initiates DB2 trace activity 300


Makes specified databases unavailable for applications


Stops the DB2 subsystem


Stops the Distributed Data Facility


Stops the acceptance of SQL statements for specified functions


Stops the acceptance of SQL CALL statements for stored procedures


Stops the resource limit facility (governor)


Stops trace activity


Terminates execution of a utility

A DSN9022I message indicates the normal end of DB2 command processing. A DSN9023I message indicates the abnormal end of DB2 command processing.

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