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https://issues.apache.org/jira/browse/DERBY-5151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13011586#comment-13011586
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Mark Holster commented on DERBY-5151:
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Mike,
I think I agree with you. After some readings I understand the standard
describes a sequence as a system to provide an unique number, with no
guarantees for the order. For my usecase I think I have to create a counter
table with the right record locking etc to create the desired functionality.
Furthermore, if it is still desired to create a patch that tunes the cache (by
properties or by sql) I'll try to create one. If not, I'm fine with closing the
issue.
> 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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