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A non-two-phase locking protocol for global concurrency control in distributed heterogeneous database systems

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1 Author(s)
Vidyasankar, K. ; Dept. of Comput. Sci., Memorial Univ. of Newfoundland, St. John''s, Nfld., Canada

A concurrency control method is proposed for global transactions in a distributed heterogeneous database system. This method is applicable when the database sites are interconnected in a rooted tree fashion. It guarantees deadlock freedom in addition to serializability. A general architecture of a heterogeneous system is given. The global transaction manager (GTM) decomposes the global transactions initiated at a site and the subtransactions received from other sites into smaller subtransactions, some of which are sent to the GTMs of the other sites, and those remaining, called g-local transactions, are to be executed by the local transaction manager (LTM) at that site. A concurrency control mechanism ensures serializability among: the local transactions (including the g-local transactions of the global ones) at each site, the global transactions and the global and local transactions together

Published in:

Knowledge and Data Engineering, IEEE Transactions on  (Volume:3 ,  Issue: 2 )

Date of Publication:

Jun 1991

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