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Speculative locking protocols to improve performance for distributed database systems
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DOI：10.1109/TKDE.2004.1269595.png)
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Abstract
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In this paper, we have proposed speculative locking (SL) protocols to improve the performance of distributed database systems (DDBSs) by trading extra processing resources. In SL, a transaction releases the lock on the data object whenever it produces corresponding after-image during its execution. By accessing both before and after-images, the waiting transaction carries out speculative executions and retains one execution based on the termination (commit or abort) mode of the preceding transactions. By carrying out multiple executions for a transaction, SL increases parallelism without violating serializability criteria. Under the naive version of SL, the number of speculative executions of the transaction explodes with data contention. By exploiting the fact that a submitted transaction is more likely to commit than abort, we propose the SL variants that process transactions efficiently by significantly reducing the number of-speculative executions. The simulation results indicate that even with manageable extra resources, these variants significantly improve-the performance over two-phase locking in the DDBS environments where transactions spend longer time for processing and transaction-aborts occur frequently.
Keywords:
distributed database
transaction processing
concurrency control
locking
performance evaluation
speculation
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