Restriction: Must follow a PROGRAM level selector.
Default: No CICS
The CICS constraint may be applied to any PROGRAM level selector. This constraint alters the algorithm which determines how many buffers to use for a file which is opened for mixed mode (random and sequential) processing. Without this constraint specified, both the random and sequential options would be weighed equally when determining the number of buffers to assign. With this constraint, the random option is assigned a higher weight than the sequential option.
This makes better use of virtual storage in an online system environment (like CICS) when both random and sequential requests are issued for a file, but the random requests are much more frequent than the sequential requests.
This constraint has no effect on any files that are using shared resources.
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