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From "Rick Hillegas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5493) Same value returned by successive calls to a sequence generator.
Date Thu, 29 Mar 2012 14:34:28 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241269#comment-13241269

Rick Hillegas commented on DERBY-5493:

Attaching derby-5493-01-ab-plusMoreTests.diff. This rev of the patch adds tests for correctness,
user-visible features, and garbage collection. Regression tests passed cleanly for me.

My plan going forward is to address Mike's concerns:

1) I will add a header tuple to SYSGHOST so that the boot-time expense of garbage collection
is reduced to one page read in most situations.

2) I will test the concurrency of this solution. If the single transaction controller turns
out to be a bottleneck, then I will try adding a transaction controller per sequence.

Touches the following additional files:


M       java/testing/org/apache/derbyTesting/functionTests/tests/upgradeTests/Changes10_9.java

Various upgrade tests.


A       java/testing/org/apache/derbyTesting/functionTests/tests/lang/t_5494.sh

This is a standalone test for the related correctness bug, DERBY-5494. I didn't wire this
test into the JUnit test runs because the test case requires that you crash the VM.

> 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
> 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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