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From "Kim Haase (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5083) Document automatic update and creation of index cardinality statistics (istat)
Date Tue, 27 Mar 2012 18:10:30 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239775#comment-13239775
] 

Kim Haase commented on DERBY-5083:
----------------------------------

It's time to work on this at last, I believe. A couple of quick questions: 

>From the release note for Derby 10.8, it appears that the properties derby.storage.indexStats.auto
and derby.storage.indexStats.log are database properties only and cannot be set at the system-wide
level -- is that true? 

Also, are these properties dynamic?

The release notes did not mention derby.storage.indexStats.trace, so I gather we chose not
to expose that property? 

Thanks!
                
> Document automatic update and creation of index cardinality statistics (istat)
> ------------------------------------------------------------------------------
>
>                 Key: DERBY-5083
>                 URL: https://issues.apache.org/jira/browse/DERBY-5083
>             Project: Derby
>          Issue Type: Task
>          Components: Documentation
>    Affects Versions: 10.8.1.2
>            Reporter: Kim Haase
>            Assignee: Kim Haase
>
> Documentation is needed for the automatic index statistics feature (DERBY-4934). It appears
that a change is needed to the Tuning Guide topic "When cardinality statistics are automatically
updated", at least.

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