Storage estimates for data sharing environments

As part of planning for a data sharing environment, you should estimate the storage requirements for coupling facility structures and for Db2 resources.

Precise estimates for the sizes of coupling facility structures are hard to provide. Every environment is different, and storage allocation is affected by the processor model and the level of coupling facility control code. Use the information in this section to estimate initial size (INITSIZE) values. Depending on how much your workload varies, consider specifying a larger value for SIZE.

For duplexed structures, the SIZE and INITSIZE parameter values apply to both instances of the structure.

The information in this section assumes that all page sets in a particular group buffer pool are defined with the same GBPCACHE attribute. You can put page sets with different GBPCACHE attributes in the same group buffer pool, but you must adjust the formulas accordingly.