Implementing Message Oriented Transaction Processing for Distributed Database Ma
Implementing Message Oriented Transaction Processing for Distributed Database Ma
Subhash Bhalla
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It also permits unblocked processing of read-only transactions and special processing facilities for time-critical transactions . 7. 1 REPLICATION SUPPORT Replication of a data at multiple sites implies that updates must be broadcasted to all participating sites. Concurrency control in such a case incurs substantial message costs and delays [GARC82a]. In case any of the replica becomes inaccessible, further updates are inhibited. Using the existing techniques, it is not economical to have a lar...ge degree of replication for processing transactions. Our message based transaction processing scheme permits large amount of replication to be supported. In the proposed method, a transaction is Implementing Message Oriented Transaction Processing 35 committed by two participents . The coordinator-site communicates the commit message to the requesting site, in order to commit a transaction. Such a mode of transaction processing is supported by [BARB86] . 7. 2 TRANSACTION COMMIT At the time the transaction is committed through a message from the coordinating node, the requesting site can supply its local clock value to the central site as a part of the acknowledgement message.
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