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https://issues.apache.org/jira/browse/DERBY-4849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926556#action_12926556
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Knut Anders Hatlen commented on DERBY-4849:
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The new test case failed because of a deadlock in one of the nightly tests:
http://dbtg.foundry.sun.com/derby/test/Daily/jvm1.5/testing/testlog/sparc/1028816-suitesAll_diff.txt
Caused by: ERROR 40001: A lock could not be obtained due to a deadlock, cycle
of locks and waiters is:
Lock : ROW, SYSSTATISTICS, (11,622)
Waiting XID : {292152, X} , APP, alter table "APP"."COUNTRIES" all update
statistics
Granted XID : {292143, S}
Lock : ROW, SYSSTATISTICS, (11,623)
Waiting XID : {292143, S} , APP, SELECT country from countries WHERE region =
'Central America'
Granted XID : {292152, X}
. The selected victim is XID : 292152.
> Re-compilation may cause duplicate entries in the XPLAIN table
> --------------------------------------------------------------
>
> Key: DERBY-4849
> URL: https://issues.apache.org/jira/browse/DERBY-4849
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.6.2.1, 10.7.1.0
> Reporter: Kristian Waagan
> Assignee: Kristian Waagan
> Priority: Minor
> Attachments: derby-4849-1a-narrow_fix.diff,
> derby-4849-2a-broad_fix.diff, derby-4849-2b-broad_fix_with_test.diff,
> derby-4849-2b-broad_fix_with_test.stat,
> derby-4849-2c-broad_fix_with_test.diff,
> derby-4849-xplain_duplicate_stacktrace.txt
>
>
> If happening at the right moment, a re-compilation request may cause
> duplicate entries in the XPLAIN statement tables.
> I have only confirmed this for the SYSXPLAIN_STATEMENTS table, and I do not
> know if the other XPLAIN tables are affected.
> The error is highly intermittent, and so far I have only been able to trigger
> it when testing the automatic index statistics update prototype.
> See the attached stack-trace for some more details.
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