Download Database Machines: Fourth International Workshop Grand by K. Hahne, P. Pilgram, D. Schuett, H. Schweppe, G. Wolf PDF

By K. Hahne, P. Pilgram, D. Schuett, H. Schweppe, G. Wolf (auth.), D. J. DeWitt, H. Boral (eds.)

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1982. 2, June 1984, Ohmsha, Ltd. and Springer-Verlag. , Query Processing Flow on RDBM Delta's FunctionallyDistributed Architecture, Proc. of Int'l Conf. on Fifth Generation Computer Systems 1984, Nov. 1984, TokYo, Japan. : Internal Network in ICOT and its Future, Proc. of ICCC, Australia, Oct. 1984. [Todd78] S. Todd, Algorithm and Hardware for a Merge Sort Using Multiple Processor, IBM J. 5, Sep. 1978. , An Enhanced Inference Mechanism for Generating Relational Algebra Queries, Proc. of 3rd ACM Symposium on Principles of Database.

2 HM Subsystem Configuration The HM subsystem consists of HM hardware and software designed to efficiently manage the storing of large amount of data to and the retrieving of data from storage area, as instructed by the RSP subsystem. 1 HM Hardware Configuration In the final configuration, the HM hardware comprises of a non-volatile high speed Database Memory Unit (DMU) having a memory capacity of 128 MB, magnetic disk units having a maximum capacity of 20 GB, disk controllers, a 32-bit processor (named HM controller, HMCTL), which controls HM execution, and magnetic tape subsystem for system logging and database loading and unloading.

C) Concurrency control Concurrency is controlled by locking the relations based on the two-phase locking method. Relations to be locked during a transaction can be explicitly locked using a start-transaction command, or they can be automatically locked before command-tree execution. All the relations are unlocked at the end of a transaction whether it is a normal or an abnormal termination. (d) Recovery management When an abort-transaction command is received from the host during command-tree execution or hardware failure in Delta and media failure are detected, relations are restored in a status before the transaction has been started.

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