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CatalogsPlease! Verify all details or suggestions with the appropriate vendor and / or vendor's manuals.IDCAMS: Use access method services for catalogs Introduction to Catalogsz/OS V1R12.0 DFSMS Managing Catalogs
Catalog SharingUsing Enhanced Catalog Sharing Mode
The Master CatalogCatalogs are used by MVS to locate datasets when a task attempts to allocate them without supplying their volume serial number; they hold records of the volume(s) on which each cataloged dataset exists. Each MVS system must have a master catalog, and there will usually also be a number of lower-level catalogs known as user catalogs. All catalog searches begin by searching the master catalog, and many major system datasets must be cataloged in it. Read more about Catalog - MVS Systems Programming By Thierry Falissard (France) Website A master catalog is the same structually, as a user catalog. For ease of backup and recovery no user datasets should be cataloged in the master catalog. The system datasets used for initialization must be in the master cat. To provide faster response to concurrent requests for catalog entries, your master catalog should primarily contain user catalog entries. User catalogs contain entries for most data sets, indexes, and volumes. How the system finds the Master Catalog
The LOADxx member is found in the SYSn.IPLPARM or in
SYS1.PARMLIB more about these data sets in the PARMLIB
section.
The system will ask for a suffix xx to be appended to SYSCAT to form a member name in SYS1.NUCLEUS, if there's no SYSCAT statement in LOADxx, or IMSI was specified A, C, D, or P (ignore LOADxx's SYSCAT). If "Enter" is pressed, then the system will pick SYSCATLG. Or you can specify a different suffix. Probably, something unpleasant will happen if you press "Enter", if there's no SYSCATLG there. Alternate Master CatalogBecause the Master catalog is vital to the functioning of a MVS data center, an alternate master catalog should be created, the alternate catalog can be used to do an IPL, at minimum an IPL can be done, the original catalog can be repaired or recovered. Use REPRO command to copy the master catalog into a newly defined catalog, the newly defined catalog should then be used as the primary catalog, and the old master should be used as the alternate Updates have to be manually added to the alternate catalog. An Alternate LOADxx member will be required User CatalogsThe user catalogs are pointed to by the Master Catalog
VLFThe Virtual Lookaside Facility LLA provides better performance when VLF services are available, so it is better (although not necessary) to start VLF before LLA. However, the operation of LLA does not depend on VLF. Determining Catalogs in VLF: F CATALOG,REPORT,CACHE Removing Catalogs from VLF: F CATALOG,NOVLF(your.catname) Please don't forget to fix your changes in SYS1.PARMLIB(COFVLFxx) Parmlib member COFVLFxx (Virtual Lookaside Facility Parameters) Enhanced Catalog Sharing and Management An IBM Redbooks publication Table of contents
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