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Status Future consideration
Workspace Db2 for z/OS
Created by Guest
Created on Jul 23, 2021

OPTIMIZER IGNORE INDEX indexcreator.indexname

Looking to replace NPI with DPSI. DSPI is created, and would like to verify that all SQLs that were using NPI, when Rebound/executed dynamically would either

a) use either newly created DPSI or another index on the table

and b) have run time performance that is acceptable


Would like to verify before dropping the index.


Access Paths can be compared via tools, but real, run time performance is also needed.

Catalog Stats can be updated to fool DB2 into trying not to pick NPI, but they're not perfect.


If catalog Stats updated and a dynamic SQL statement has a poor path, it would need to be invalidated from the cache (ie via runstats) If the index is large, this can take some time.


Looking to be able to ALTER an INDEX to either have DB2 optimizer ignore this index at explain time, and then be able to ALTER back on, if needed. Static SQLs would need to be rebound, but dynamic SQLs using the table would be re-explained when the index is turned back on for optimization.

Needed By Not sure -- Just thought it was cool