منابع مشابه
Distributed Optimistic Concurrency Considered Optimistic
Optimistic concurrency relies on speculative execution, read-write conflict detection, and checkpointrollback techniques to provide a programming model that replaces locks with the abstraction of atomic, isolated execution of critical sections. Previous research has shown that on chip multi-processors, a class of workloads featuring irregular parallelism and rare read-write conflicts can reap s...
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Ryu and Thomasian have analyzed several varieties of optimistic concurrency control under two assumptions: that the characteristics of a transaction remain constant throughout its execution, and that the proportion of committing transactions is xed (in order to avoid an unrealistic biasing of the transaction mixture). We show how both of these assumptions can be relaxed. First, we allow an abor...
متن کاملIs the Optimism in Optimistic Concurrency Warranted?
Optimistic synchronization allows concurrent execution of critical sections while performing dynamic conflict detection and recovery. Optimistic synchronization will increase performance only if critical regions are data independent—concurrent critical sections access disjoint data most of the time. Optimistic synchronization primitives, such as transactional memory, will improve the performanc...
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Attstraet-Gptimistic concurrency control schemes allow uncontrolled access to shared data objects during transaction processing under the explicit assumption that read and write coticts among transactions are rare events. Before a transaction commits, the DBMS has to validate that no conflict has occurred Conflict resolution mainly relies on transaction abort. Two different optimistic concurren...
متن کاملTitle : Bounded Locking for Optimistic Concurrency Control
Optimistic methods of concurrency control are gaining popularity. This is especially true with the resurgence of mobile and distributed databases, which inherently rely on optimistic techniques to improve availability and performance of the database system. A key problem with optimistic techniques is that they do not perform well in highly conflict prone environments. Pessimistic techniques, es...
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ژورنال
عنوان ژورنال: ACM SIGPLAN Notices
سال: 2016
ISSN: 0362-1340,1558-1160
DOI: 10.1145/3016078.2851146