IBM®InfoSphere®Optim™ Query
Workload Tuner for DB2® for z/OS® provides tools for improving
the performance of query workloads.
For a list of scenarios in which query-workload tuning can
be helpful and steps that you can follow for each scenario, see Scenarios for tuning query workloads.
Preparing for tuning
Before tuning query workloads, ensure that you have the
right authorities and privileges, that a license is activated on your
data server, that global default values are set to the values that
you want, and that other important default values are set.
Consolidating EXPLAIN information
You can consolidate EXPLAIN information for a query workload
to reduce the amount of storage that information requires.