Corez/OS30 min
Datasets and catalog concepts
Files on z/OS are not files. They have names with rules, a shape declared up front, and a catalog that turns a name into a location.
What you will be able to do
- Read a dataset name and know what it tells you
- Choose between sequential, partitioned and VSAM
- Explain how the system finds a dataset by name alone
Lessons
- Dataset names and what they tell youA dataset name is not free text. It is a series of qualifiers separated by dots, each up to eight characters, up to 44 characters in total. At almost every site the qualifiers…
- Sequential, partitioned, and the restz/OS has several dataset organisations, and you pick one based on how the data will be used. Three cover most of what you will meet: sequential for flat files, partitioned for…
- Catalogs: how a name becomes a locationYou refer to a dataset by name, and the system finds it without you saying which disk it is on. That indirection is the catalog. Understanding it explains a whole family of…
- The utilities that move data aroundYou rarely write a program to copy, compare or reformat a file. There is a utility for it, and knowing five of them covers most day-to-day work.
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