From the point of view of the CXX, the catalog of a database causes the database to be opened.
Note: No data set is opened because of a catalog.
We strongly recommend that you use the MUF ACCESS OPTIMIZE option. If you follow our recommendation and run with that option and if Single User DBUTLTY functions are to be executed (for example, INIT AREA=IXX), it is possible that a COMM CLOSE might be needed after a catalog.
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