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Utility CTDAMUTI is used to copy, move and delete CDAM datasets. (CTDAUTI is the program name for utility CTDAMUTI.)
The CDAM dataset is composed of one or more system datasets which are logically connected. They appear to the application program as one sequential dataset only when they are interfaced using CDAM (using parameter SUBSYS).
Standard system maintenance utilities are able to function only on one logical extent (system dataset). To delete an entire CDAM dataset, the user must physically delete all the logical extents of the dataset. Utility CTDAMUTI enables the user to delete all extents of a CDAM dataset using regular CDAM parameters.
Note: For deleting unneeded CDAM files, also see utility CTDCCU in the INCONTROL for z/OS Utilities Guide.
Another important use of utility CTDAMUTI is for emergency situations. If for some reason, the CDAM subsystem cannot be started and it is therefore impossible to read the CDAM datasets using the normal SUBSYS parameter, this utility can decompress the sysout to its original (non-compressed) form even if the CDAM subsystem is not active.
If DD statement UTICOPY is present in the job which activates utility CTDAMUTI, output is written to the file referenced by this DD statement instead of to the SPOOL. Utility CTDAMUTI sets the DCB parameters of this output file according to the original report, that is,
If ‘DUMMY’ is specified in the UTICOPY DD statement, the CTDAMUTI utility lists the CDAM files that fit specified selection criteria.
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