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Q: What is UNLOAD utility?
Answer:
UNLOAD extracts data to sequential file. UNLOAD FROM TABLE name. Output format matches LOAD input. Used for data migration, backup, extract. Can include WHERE clause for filtering.
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Q: How to handle SMS conversion?
Answer:
SMS manages storage automatically. Migrate VSAM to SMS: DATACLAS, STORCLAS, MGMTCLAS. ACS routines for assignment. Remove explicit VOL/UNIT. Benefits: automation, management.
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Q: What is INSERT...SELECT?
Answer:
INSERT INTO table SELECT cols FROM other_table WHERE condition. Bulk insert from query. Column count/types must match. Faster than row-by-row. Can transform data during insert. Good for data migration.
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Q: Explain EXPORT utility
Answer:
EXPORT creates portable copy with catalog info. IDCAMS EXPORT ds.name OUTFILE(dd). Includes cluster definition. IMPORT recreates on target system. Good for migration.
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Q: What is DFSMS?
Answer:
DFSMS (Data Facility Storage Management Subsystem) automates storage management. Components: SMS, HSM (migration), DFRMM (tape). ACS routines assign classes. Reduces JCL complexity. DATACLAS defines data characteristics.
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Q: What is MGMTCLAS parameter?
Answer:
MGMTCLAS assigns SMS management class. Controls migration, backup, retention. MGMTCLAS=classname. Defines data lifecycle. HSM uses management class. Installation-defined policies.
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Q: What is BDAM conversion to VSAM?
Answer:
BDAM is block-oriented, VSAM is record-oriented. Convert: analyze BDAM access, choose KSDS/RRDS/ESDS. REPRO or IDCAMS copy. Program changes for VSAM access. Test thoroughly.