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When tuning the size of your databases, you need to consider the control interval size (CISIZE), maximum record size (RECSZ), and free space.
NDB database records should be tuned to fit into a single VSAM record.
Note: For information about the storage needed by an NDB record, see the Network Control Language Programming Guide. Use this information to choose a suitable CISIZE that gives good track utilization.
If the NDB is subject to heavy update activity, pick a reasonably large free space amount. This enables data and key record alterations in the NDB structure to take place without causing excessive numbers of CI/CA splits.
You should also regularly reorganize your databases using IBM's IDCAMS REPRO command.
Note: Currently, you cannot change the record size of an NDB without logically unloading and reloading it.
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