High performance support for XA protocols in a clustered...

Details High performance support for XA protocols in a clustered... High performance support for XA protocols in a clustered...

2007-06-19

2010-06-22

Lewis, Cheryl (Department: 2167)

Data processing: database and file management or data structures

File or database maintenance

Database recovery

C707S703000

Reexamination Certificate

active

07743036

ABSTRACT:
A shared memory device called the Coupling Facility (CF) is used to record the indoubt transaction entries for each member of the database cluster, avoiding the CPU cost and elapsed time impact of persisting this information to disk (either via a log write or a relational table I/O). The CF provides full read/write access and data coherency for concurrent access by all the members in the database cluster. At any given point in time, the CF will contain the full list of indoubt transactions for the entire database cluster. CF duplexing is used to guarantee the integrity of the CF structure used for the indoubt list. In the event of complete loss of both CF structures (which will not happen except in major disaster situations), data sharing group restart processing can reconstruct the CF structures from the individual member logs.

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