CICS ⭐ Featured
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Q: Explain CICS task and transaction

Answer:
Transaction is unit of work started by TRANSID. Task is CICS execution instance. One transaction may create multiple tasks. Task has TCA (Task Control Area). EIBTRNID has transaction ID. Concurrent tasks share resources.
task transaction concept
DB2 ⭐ Featured
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Q: What is DB2 subsystem?

Answer:
Subsystem is DB2 instance. Has unique name (4 chars). Multiple subsystems on same LPAR. Each has own catalog, logs, data. SSID in application connection. Data sharing allows multi-subsystem access.
subsystem ssid instance