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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2122) Optimize ContainerLock.isCompatible()
Date Tue, 28 Nov 2006 19:29:23 GMT
     [ http://issues.apache.org/jira/browse/DERBY-2122?page=all ]

Knut Anders Hatlen updated DERBY-2122:
--------------------------------------

    Derby Info: [Patch Available]

> Optimize ContainerLock.isCompatible()
> -------------------------------------
>
>                 Key: DERBY-2122
>                 URL: http://issues.apache.org/jira/browse/DERBY-2122
>             Project: Derby
>          Issue Type: Improvement
>          Components: Store, Performance
>    Affects Versions: 10.2.1.6
>            Reporter: Knut Anders Hatlen
>         Assigned To: Knut Anders Hatlen
>            Priority: Trivial
>         Attachments: derby-2122-v1.diff, derby-2122-v1.stat
>
>
> The numbers at http://wiki.apache.org/db-derby/Derby1961MethodCalls indicate that ContainerLock.isCompatible()
is called many times per transaction, at least when there are multiple concurrent clients
operating on the same containers. Currently, it looks into a two-dimensional array to find
out whether two locks are compatible. This could be implemented more efficiently, for instance
by having a bit pattern in each ContainerLock object representing which lock types it is compatible
with.

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