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From "Rick Hillegas (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-5493) Same value returned by successive calls to a sequence generator.
Date Wed, 18 Apr 2012 12:25:41 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rick Hillegas updated DERBY-5493:

    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:,,,,,
>            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,
> 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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