[jira] [Updated] (DERBY-5999) Improve documentation on index key lengths

["Kim Haase (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-5999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kim Haase updated DERBY-5999:
-----------------------------

    Attachment: DERBY-5999.zip
                DERBY-5999.stat
                DERBY-5999.diff

Attaching DERBY-5999.diff, DERBY-5999.stat, and DERBY-5999.zip, with changes to two topics:

M       src/ref/rrefsqlj41207.dita
M       src/tuning/ctundepth1002853.dita

There is no need, I think, to add a warning to the documentation of the CHAR data type. Since a CHAR can be no larger than 254 bytes, there is no danger of bumping into the page size limit. 

Please let me know if you have any suggestions for changes. 

                
> Improve documentation on index key lengths
> ------------------------------------------
>
>                 Key: DERBY-5999
>                 URL: https://issues.apache.org/jira/browse/DERBY-5999
>             Project: Derby
>          Issue Type: Sub-task
>          Components: Documentation
>    Affects Versions: 10.9.1.0
>            Reporter: Kim Haase
>            Assignee: Kim Haase
>            Priority: Minor
>         Attachments: DERBY-5999.diff, DERBY-5999.stat, DERBY-5999.zip
>
>
> DERBY-5881 includes the following suggestion:
> 3. The documentation for sized datatypes like char and varchar should be updated to warn about indexing limitations (which would most likely be encounterd with such datatypes).
> It probably also makes sense to add this recommendation to the introductory topic on indexes in the Tuning Guide (http://db.apache.org/derby/docs/dev/tuning/ctunperf10679.html).

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