zEC12 Coupling Facility

Performance Improvements - "Cache write-around" enhancement

DB2 can now protect the GBP working set by conditionally writing
updated pages directly to disk rather than flooding the GBP
structure with pages that probably will not be re-referenced.
Performance measurements in IBM showed DB2 batch performance
improvements of up to 50% in environments that were previously
experiencing severe GBP-full conditions
CFlevel 18 and DB2 V11