Under normal operation, CA Top Secret for IMS shares a signon XREF table in ECSA between the IMS control region and its associated message regions. This implementation can reduce the number of signons performed by an IMS subsystem and reduce the number of consequent I/O's to the security file when PSB, DBD, or DB2 security is involved. In situations where only transaction security takes place, the ECSA table is unlikely to provide any efficiency while adding additional ECSA requirements for the common XREF table. The ECSA XREF table has no effect on IMS MSC security as implemented in CA Top Secret.
For situations where ECSA is at a premium, the control option OPTIONS(19) can be added to the CA Top Secret PARMLIB to disable the use of a common XREF table between the IMS control region and its associated messages region. When OPTIONS(19) is in force, the XREF tables for the control region and message regions are normally kept separately in private storage. Exceptions can be arranged for particularly intensive IMS systems when OPTIONS(19) is in force, to allow such systems to operate more efficiently with the ECSA XREF table.
To add the MRO option to the control region acid and to each of the associated message regions, enter:
TSS ADDTO(control region acid) MRO
TSS ADDTO(message regions acid) MRO
Failure to add the MRO attribute to all associated regions can cause abnormal termination of IMS. The MRO attribute has no effect if OPTIONS(19) is disabled, which is the default.
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