CoreData22 min
VSAM basics
The indexed file organisation behind a great deal of online data. Four types, one that matters most, and one utility that does everything.
What you will be able to do
- Choose the right VSAM type for a requirement
- Explain how a KSDS finds a record by key
- Define, load and inspect a file with IDCAMS
Lessons
- The four VSAM typesVSAM is a family of file organisations for data you need to reach quickly by key or position, rather than by reading from the start.
- IDCAMS: define, load, inspectIDCAMS is the utility for everything VSAM. Three commands cover most of what you will do: DEFINE creates a cluster, REPRO copies data in or out, and LISTCAT tells you what state…
- Using VSAM from a programFrom COBOL a KSDS looks like an indexed file: you declare a record key and use READ, WRITE, REWRITE and DELETE. From CICS it looks like a set of file control commands.
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