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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5494) Same value returned by successive calls to a sequence generator flanking an unorderly shutdown.
Date Fri, 08 Jun 2012 16:31:24 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291849#comment-13291849
] 

Kathey Marsden commented on DERBY-5494:
---------------------------------------

I think  *if* we made a new release candidate, the performance improvement and relation to
derby.language.sequence.preallocator would be worth mentioning in the release note.  Also
might want to mention that users seeking increased performance for identity columns might
want to try implementing as sequences. That way we might encourage users to exercise sequences
more in preparation for ultimately transitioning identity columns to use this code.  If there
is not a new release candidate, a blurb in the announcement might do just as well or even
garner more attention.



                
> Same value returned by successive calls to a sequence generator flanking an unorderly
shutdown.
> -----------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5494
>                 URL: https://issues.apache.org/jira/browse/DERBY-5494
>             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, 10.9.1.0
>            Reporter: Rick Hillegas
>            Assignee: Mike Matrigali
>              Labels: derby_backport_reject_10_8, derby_triage10_9
>             Fix For: 10.9.1.0, 10.10.0.0
>
>         Attachments: derby-5494_3.diff, derby-5494_diff_1a.txt, derby-5494_diff_2.txt
>
>
> The following sequence of steps causes a sequence generator to return the same value
on successive NEXT VALUE FOR calls.
> 1) Bring up ij and issue the following commands:
> connect 'jdbc:derby:db;create=true';
> create sequence s;
> values next value for s; 
> 2) Control-c out of ij so that the engine comes down hard without an orderly shutdown.
> 3) Now bring up ij again and issue the following commands:
> connect 'jdbc:derby:db';
> values next value for s; 
> Thanks to Knut for finding this one.

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