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They also provide global serializability without local concurrency control information distribution, can be combined with any relevant concurrency control, and allow optimistic (non-blocking) implementations. Both use additional information for relaxing CO constraints and achieving better concurrency and performance.
Optimistic concurrency control transactions involve these phases: [2] Begin: Record a timestamp marking the transaction's beginning. Modify: Read database values, and tentatively write changes. Validate: Check whether other transactions have modified data that this transaction has used (read or written). This includes transactions that ...
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Concurrency control algorithms (19 P) T. Transaction processing (1 C, 106 P) ... Optimistic concurrency control; Overlapped I/O; P. Path expression; Priority ceiling ...
The objective is to provide more concurrency if extra resources are available. This approach is employed in a variety of areas, including branch prediction in pipelined processors, value prediction for exploiting value locality, prefetching memory and files, and optimistic concurrency control in database systems. [1] [2] [3]
Transactional memory provides optimistic concurrency control by allowing threads to run in parallel with minimal interference. [2] The goal of transactional memory systems is to transparently support regions of code marked as transactions by enforcing atomicity , consistency and isolation .
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In Computer Science, in the field of databases, non-lock concurrency control is a concurrency control method used in relational databases without using locking. There are several non-lock concurrency control methods, which involve the use of timestamps on transaction to determine transaction priority: Optimistic concurrency control