The book Object Sharing in a Multi User Hypertext System was written by author Melvina H Melvina Hani Tarazi Here you can read free online of Object Sharing in a Multi User Hypertext System book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Object Sharing in a Multi User Hypertext System a good or bad book?
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4. 1 Distributed Relational Database Systems Distnbuted-INGRES Distributed-INGRES [Stonebraker "9] v. As developjcd a: •j'. E Uruversirv- of Caiifomia at Berkeley, as a disnbuted version of the relanonal database system INGRES. It uses 2- phase-lockjng for concurrency cono-ol. Deadlocks are detected and resolved wld^ a centralized deadlock detector. " describes the concurrency conaol and consistency of multiple copies of data m Discributed-ENGRES. The basic approach is primary copy 2PL. Note ho...wever, thai the commercial product ENGRES/'STAR as of 1987 did not suppon Data Replication. RTI has commined publicly to such an enhancement in the future. R* is a prototype system [Haas 82] developed at the IBM San Jose Research Lab in California. It uses 2-phasc-locking for concuirency control. Deadlocks arc detected and resolved using a distributed deadlock detection mechanism. When a deadlock is detected, its resolution consists of aborting one of the transactions m the wait-for cycle. R* does not suppon data replication, however, an alternative to replication was introduced in the nodon cf snapshots Snapshots pressr.
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