The IMS Interface › Interface Commands › COMPRESS Command

COMPRESS Command

The IMS Interface requires an abbreviated log tape to:

• generate graphs with the FFGRAPH command
• create a data set for the Report Writer using the TRANSLATE command

Use the COMPRESS command to create this abbreviated version of the IMS log tape.

The abbreviated log tape contains only type 07 records. It considerably reduces the volume of useful data that may be retained for extended analysis. It also reduces interface run time for subsequent passes of the data.

If the COMPRESS command is encountered with the first set of TRANSLATE and FFGRAPH commands, subsequent sets of TRANSLATE and FFGRAPH commands use the compressed file as input instead of the raw IMS log data set. Therefore, it is efficient to include a COMPRESS command in the first command set of a multiple command set run, even if the compressed file is not to be retained.

The compressed file is written to the data set specified by the CAIJRCM ddname. If no COMPRESS command is given to the interface, the ddname CAIJRCM is not referenced. If a COMPRESS command is executed, subsequent command sets in the same interface execution use the compressed file as input, through the CAIJRCM ddname, and the CAIJRII ddname is not read from again.