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AssigneeInternational Business Machines Corporation
InventorsCurt Lee Cotner, Brian K. Howell, Jeffrey William Josten, James Willis Pickel
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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.
A method for facilitating performance of 2-phase commit operations between transaction managers and resource managers in a database cluster, said method comprising the steps of:
A coupling facility recording indoubt transaction entries for each member of a remote database system, said coupling facility comprising:
An article of manufacture comprising computer usable medium having computer readable program code embodied therein facilitating performance of 2-phase commit operations between transaction managers and resource managers in a database cluster, said medium comprising:
Dependencies are inferred from the claim text.