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https://issues.apache.org/jira/browse/DERBY-5493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Hillegas updated DERBY-5493:
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Attachment: derby-5493-01-ag-mergedWith5494.diff
Attaching derby-5493-01-ag-mergedWith5494.diff. This is the patch after syncing
with the trunk and merging with Mike's fix to DERBY-5494.
At this point the tests run cleanly. However, as Mike suspected, concurrency
has returned to the situation with the 01-ae patch, what was reported on
DERBY-5471.
In a follow-on patch, I think I will boost the pre-allocation size to 100
unless someone objects.
Committed at subversion revision 1327471.
> Same value returned by successive calls to a sequence generator.
> ----------------------------------------------------------------
>
> Key: DERBY-5493
> URL: https://issues.apache.org/jira/browse/DERBY-5493
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.6.1.0, 10.6.2.1, 10.7.1.1, 10.8.1.2, 10.8.2.2,
> 10.9.0.0
> Reporter: Rick Hillegas
> Assignee: Rick Hillegas
> Labels: derby_triage10_9
> Attachments: derby-5493-01-aa-correctnessPlusPeekerPlusTest.diff,
> derby-5493-01-ad-simplerApproach.diff,
> derby-5493-01-ae-simplerApproachWithCrashJUnitTest.diff,
> derby-5493-01-af-usersubtran.diff, derby-5493-01-ag-mergedWith5494.diff
>
>
> The following script shows the same value being returned from a sequence
> generator by two successive NEXT VALUE FOR calls. Thanks to Knut for finding
> this:
> connect 'jdbc:derby:memory:db;create=true';
> create table t (x int);
> create sequence s;
> autocommit off;
> select count(*) from sys.syssequences with rs;
> values next value for s;
> drop table t;
> rollback;
> -- same value as previous call
> values next value for s;
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