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Usually to run any ADHOC queries, we make use of the SYSDUMMY1 table. Mostly to get the CURRENT TIMESTAMP or to assign a system value to a HOST variable. In these scenarios, it is advisable to use SET (SET :HOST-VAR = CURRENT TIMESTAMP), because it is lot of times cheaper to use SET than SYSDUMMY1.

 

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KNOW YOUR MAINFRAME
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DB2 Performance – Using SET vs SYSDUMMY1 table
DB2 Performace – Predicates Processing Order
DB2 External Stored Procedures
DB2 UPDATE QUERY – UPDATE TABLE1 FROM TABLE2 DATA
DB2 PERFORMANCE ISSUE (When using EXISTS)
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HOW DO YOU FIND WHO HAS ACTUALLY LOADED THE DB2 TABLE RECENTLY
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DB2 and SQL INTERVIEW QUESTIONS
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DB2 BIND OPTIONS and ISOLATION
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