DB2 ⭐ Featured
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Q: What is XML support in DB2?

Answer:
DB2 stores XML natively. XMLTYPE column. XMLPARSE, XMLSERIALIZE for conversion. XQuery for querying. XMLTABLE extracts relational from XML. XML indexes for performance. Powerful for document storage.
xml storage xquery
CICS ⭐ Featured
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Q: How to use ENQ/DEQ?

Answer:
ENQ serializes resources. EXEC CICS ENQ RESOURCE(name) LENGTH(len). DEQ releases. Prevents concurrent access. NOSUSPEND returns immediately if busy. Use for data integrity.
enq deq lock
JCL
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Q: What is VOL parameter?

Answer:
VOL specifies volume. VOL=SER=PACK01 specific volume. VOL=REF=*.STEP.DD copies volume from previous. VOL=(,RETAIN) keeps volume mounted. VOL=(,,,5) allows 5 volumes. SER overrides SMS placement. Use cautiously.
vol volume serial