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https://issues.apache.org/jira/browse/OPENJPA-2450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jody Grassel closed OPENJPA-2450.
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> Option to disable execution of ALTER SEQUENCE...INCREMENT BY statement for
> sequences.
> -------------------------------------------------------------------------------------
>
> Key: OPENJPA-2450
> URL: https://issues.apache.org/jira/browse/OPENJPA-2450
> Project: OpenJPA
> Issue Type: Improvement
> Components: sql
> Reporter: Heath Thomann
> Assignee: Heath Thomann
> Priority: Minor
> Fix For: 2.1.2, 2.2.1.1, 2.2.3, 2.3.1, 2.4.0
>
> Attachments: OPENJPA-2450-2.2.1.x.patch
>
>
> OpenJPA attempts to execute an ALTER SEQUENCE....INCREMENT BY SQL statement
> for a user defined sequence. This is done to ensure that the
> 'allocationSize' value defined by the entity's sequence, or default value,
> matches the sequence defined in the database. For example, with an
> allocationSize of 1000 for a sequence named 'SEQ_JPASAMPLE', the following
> SQL will be generated (the SQL might vary slightly depending on the
> databases):
> ALTER SEQUENCE SEQ_JPASAMPLE INCREMENT BY 1000
> If the user executing this command doesn't have permissions to execute the
> command, it will fail and in turn OpenJPA will disable sequence caching.
> User's have asked for a way to disable this SQL statement and have full
> control over the sequence they define in their domain model and its
> corresponding definition in the database.
> We can easily add a property to disable this SQL statement. However, the
> onus is then on the user to ensure that they keep in sync the
> 'allocationSize' in their entity's sequence definition with the 'INCREMENT
> BY' for the corresponding sequence in the database.
> To disable this sequence I propose a new property on DBDictionary named
> 'disableAlterSeqenceIncrementBy', with a default of false. I also propose
> adding a warning message, logged once, when this property is enabled and we
> avoid executing the SQL.
> Thanks,
> Heath Thomann
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