[
https://issues.apache.org/jira/browse/DERBY-3011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Rick Hillegas closed DERBY-3011.
--------------------------------
Resolution: Won't Fix
Closing this issue since the person who logged it seems to have lost interest.
The issue can always be re-opened if someone else is interested.
> Implementing Speculative locking protocol to Derby
> ---------------------------------------------------
>
> Key: DERBY-3011
> URL: https://issues.apache.org/jira/browse/DERBY-3011
> Project: Derby
> Issue Type: Improvement
> Components: Store
> Reporter: Ravinder Reddy
> Assignee: Ravinder Reddy
> Priority: Minor
>
> Speculative Locking Algorithm is a Locking Protocol. All the currently
> available databases are using 2-Phase Locking. The problem with 2 phase
> locking algorithm is, concurrency is less and waiting time is more. On the
> other hand in Speculative Locking protocol waiting time has been reduced
> drastically.
> In Speculative Locking algorithm the only waiting time is till the
> formation of last write image of a data item in the database.
> In Speculative Locking , a transaction releases the lock on the data object
> whenever it produces corresponding after-image during it's 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.
> Speculative Locking Protocol is a new Transaction management Protocol,
> which has not been implemented yet in any of the Database Management systems
> available in the market. It has been proved by various simulations that this
> Locking Protocol outperforms all the 2-Phase Locking Protocols and their
> derivatives.
> This Locking Protocol when implemented in any Database Management System
> will bring revolution in the Efficiency of DBMS and will become more robust.
> The Original paper can be found at
>
> http://portal.acm.org/citation.cfm?id=962744
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
