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CA Compress supports only QSAM and BSAM access to physical sequential data sets. Other access methods, notably EXCP and BDAM, result in no compression or expansion. SORT and some other programs can be forced to use BSAM by adding them to the SORT exclusion tables, which are described in the topic Exclusion Facility in the CA Compress Reference Guide.
CA Compress does not support the following options for VSAM, most notably control interval processing, so any program using this option is unable to access expanded data. The data are processed in compressed format.
These functions allow the program to read entire control intervals. Within the control interval are control fields that VSAM uses that cannot be compressed (and should not be modified outside of VSAM record management). The data within the control interval can be compressed, but only through the VSAM record management (GETs and PUTs for RECORDS) interface.
This function permits VSAM record level sharing. CA Compress is unable to support this function, and RLS OPENs fail. RLS is incompatible with LSR and AMP=BUFND, so VPE detects the RLS specification and ignores the data set.
GSR allows an APF-authorized program running in protect keys 0–7 to build a shared resource pool in CSA to be accessed by multiple address spaces.
The CBIC function lets an APF-authorized program have VSAM build the necessary control blocks in common storage so that the data set ACB can be used by multiple address spaces. The CBIC function is invoked by turning on the ACBCBIC bit in the field ACBINFL2 of the ACB.
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