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https://issues.apache.org/jira/browse/DERBY-6419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13840764#comment-13840764
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Dag H. Wanvik edited comment on DERBY-6419 at 12/6/13 1:06 AM:
---------------------------------------------------------------
Uploading a follow-up patch. From my sandbox git commit log:
Only short circuit waiting for lock in BTree scan to check duplicates
for a deferred unique/pk constraint if constraint mode is deferred
(i.e. not if immediate).
Added a test case lifted from UniqueConstraintMultiThreadedTest, which
exposed the issue when we run the regressions with default deferrable
by default (see DERBY-532).
was (Author: dagw):
Uploading a follow-up patch. From my sandbox git commit log:
Only short circuit waiting for lock in BTree scan to check duplicates
for a deferred unique/pk constraint if constraint mode is deferred
(i.e. not if immediate).
Added a test case lifted from UniqueConstraintMultiThrededTest, which
exposed the issue when we run the regressions with default deferrable
by default (see DERBY-532).
> Make BTree scan honor OPENMODE_LOCK_NOWAIT for row locks.
> ----------------------------------------------------------
>
> Key: DERBY-6419
> URL: https://issues.apache.org/jira/browse/DERBY-6419
> Project: Derby
> Issue Type: Sub-task
> Components: Store
> Reporter: Dag H. Wanvik
> Attachments: derby-6419-1.diff, derby-6419-1.status,
> derby-6419-followup.diff, derby-6419-followup.status
>
>
> Optimization desirable to support deferred constraints.
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