The ASCHPMxx parmlib member contains scheduling information for the ASCH transaction scheduler. The statements define classes of transaction initiators and provide default scheduling information when it is missing from a TP profile.
For more information about using APPC, see z/OS MVS Planning: APPC/MVS Management.
An installation can control scheduling characteristics with different versions of the ASCHPMxx parmlib member. One member might contain startup values and other members contain customized values.
To start the ASCH address space and set up classes and defaults for the ASCH transaction scheduler, specify ASCHPMxx with a START ASCH command. To modify classes and defaults after initialization, specify ASCHPMxx with the SET ASCH operator command. More than one ASCHPMxx parmlib member can be specified on a START or a SET ASCH command. If you specify more than one member on the START or SET command, APPC processes the statements in the order specified and creates a cumulative configuration. For more information about the START and SET commands, see z/OS MVS System Commands.
If you do not specify a parmlib member with the START command, the system uses the default member, ASCHPM00. If ASCHPM00 does not exist, APPC/MVS issues an informational message.