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Status Under review
Workspace Db2 for z/OS
Created by Guest
Created on Oct 6, 2024

RELATED IDEAS

simplified code path for RI checking

We had an interesting discussion with the development team about this.

As I already mentioned, the RI code path is quite different than the R-scan which may use one or more predicates to evaluate the qualifying rows. The main module that is driving the RI checking does not simply extract the column(s) value, but also involves a complex process to construct a new value (either parent or foreign key) from the key field(s) in certain format under certain index attributes. The RI checking has to deal with all possible RI rules and situations, so it's much more complex than what we do in an regular R-scan looking for qualifying rows. The result of that is a much longer code path, hence more CPU usage.

For your scenario, the most simple case, it might be possible to create a 'special' (simplified) code path, just for this type of case, that would perform better. However this is a complex code area, so it will take some studying and lots of testing to see if it is feasible. It would certainly be something beyond the scope of an APAR.

The solution of creating an index is not a good one, because of performance of inserts to the parent table that are much more often.

Needed By Quarter

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