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DB2® for z/OS® Version 8 DBA Certification Guide by Susan Lawson

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Chapter 9. Data Sharing

• Data sharing components

• Maintaining data integrity

• Performance and processing costs

• Movement to data sharing

• Distributed processing

• Recovery considerations

Data sharing, available in DB2 since version 4, allows an application to run on one or more DB2 subsystems in a parallel sysplex environment. The applications can read and write to the same data concurrently. Prior to data sharing, DDF was used to access data on other subsystems, or other, more creative means were used, such as replication between subsystems.

The subsystems that can share data must belong to a data sharing group. The subsystems in the group are known as members. Up to 32 members are allowed in a data sharing group. Only members in the group ...

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