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https://issues.apache.org/jira/browse/DERBY-6653?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kim Haase closed DERBY-6653.
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> Data type limitations on indexes should be in Reference Manual
> --------------------------------------------------------------
>
> Key: DERBY-6653
> URL: https://issues.apache.org/jira/browse/DERBY-6653
> Project: Derby
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 10.11.1.1
> Reporter: Kim Haase
> Assignee: Kim Haase
> Priority: Minor
> Fix For: 10.11.1.1
>
> Attachments: DERBY-6653.diff, DERBY-6653.stat, DERBY-6653.zip
>
>
> The Tuning Guide topic "Create useful indexes"
> (http://db.apache.org/derby/docs/10.10/tuning/ctundepth1002853.html) has the
> following excessively vague note at the end:
> "Note: Derby does not support indexing on columns with data types like BLOB,
> CLOB, and XML."
> The topic also has a cross-reference to the "CREATE INDEX statement" topic in
> the Derby Reference Manual, but that topic says nothing about data type
> limitations for index columns.
> In an email exchange, Knut says that LONG VARCHAR and user-defined types
> should be added to make the list complete, but he also suggests moving this
> information from the tuning guide to the "CREATE INDEX statement" topic in
> the Reference Manual, since we already reference that topic and since the
> information needs to be there.
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