Chapter 12. Data sharing with your DB2 data
The data sharing function of DB2 UDB for z/OS enables applications that run on more than one DB2 UDB for z/OS subsystem to read from and write to the same set of data concurrently. 
DB2 subsystems that share data must belong to a DB2 data sharing group, which runs on a zSeries Parallel Sysplex cluster. A data sharing group is a collection of one or more DB2 subsystems that access shared DB2 data.
You read about Parallel Sysplex technology in “Providing availability and scalability ...
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