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From "Mark Holster (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5151) Sequence without cache
Date Fri, 25 Mar 2011 14:31:06 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13011216#comment-13011216
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Mark Holster commented on DERBY-5151:
-------------------------------------

Hi Bryan,

You are right, my proposed solution has a different syntax than the 4 mentioned. That is because
it seems logical to me to follow the "cycle | no cycle" options. Actually, I don't care how
the syntax is. I was wondering if a property really is desired when most vendors allow this
by sql. I personally find a property more inconvenient to maintain than non standardized sql.
Is a sequence standardized anyway??

But indeed, that's my opinion. And like I said, I'm fine with creating a patch that has a
property based solution. I was just wondering the sql bases solution was considered.

Mark 



> Sequence without cache
> ----------------------
>
>                 Key: DERBY-5151
>                 URL: https://issues.apache.org/jira/browse/DERBY-5151
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Mark Holster
>         Attachments: sequence-no-cache.patch
>
>
> Currently, a sequence in Derby always uses a pre allocating cache. I'm working on an
usecase which requires a number to increase with a fixed value. The usecase fails after a
restart because of the pre allocating cache.
> I've created a patch that adds the options CACHE | NO CACHE to the create sequence statement.
When no cache is provided, the pre allocating cache size will be set to 1, which results in
a "no cache sequence".
> I've followed the CYCLE | NO CYCLE code as much as possible. Tested it in my own app
and it seems to work fine.

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