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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4121) Documentation: more UPDATE_STATISTICS fixes needed for Reference Manual and Tuning Derby
Date Wed, 08 Apr 2009 23:22:13 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12697325#action_12697325

Kathey Marsden commented on DERBY-4121:

Thanks Kim for picking up this issue. I think you are right about the types being missing
and the types as you describe them seem correct to me.

The changes look good, but if you are making another round anyway, I think it would be good
to preface the following statement:

It is a good idea to call the SYSCS_UTIL.SYSCS_UPDATE_STATISTICS procedure when the number
of distinct values in an index is likely to have changed significantly.


Once statistics have been created, they cannot be dropped and should be maintained.

> Documentation: more UPDATE_STATISTICS fixes needed for Reference Manual and Tuning Derby
> ----------------------------------------------------------------------------------------
>                 Key: DERBY-4121
>                 URL: https://issues.apache.org/jira/browse/DERBY-4121
>             Project: Derby
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions:
>            Reporter: Kim Haase
>            Assignee: Kim Haase
>            Priority: Minor
>         Attachments: DERBY-4121.diff, DERBY-4121.stat, DERBY-4121.zip
> Kathey Marsden comments on DERBY-3787:
> Not a show stopper for the release, but in beginning my buddy testing,
>  I noticed the examples should use CALL e.g.
> Also in the Tuning Guide under Working with Cardinality Statistics -> When Cardinality
Statistics Go Stale we should refer users to the SYSCS_UTIL.SYSCS_UPDATE_STATISTICS stored
procedure to update their statistics and cross reference the reference guide.
> Myrna van Lunteren suggests a new issue for this, so I'm filing it.

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