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Date: Thu, 29 Mar 2012 13:10:27 +0000 (UTC)
From: "Kristian Waagan (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (DERBY-5083) Document automatic update and
 creation of index cardinality statistics (istat)
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    [ https://issues.apache.org/jira/browse/DERBY-5083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241202#comment-13241202 ] 

Kristian Waagan commented on DERBY-5083:
----------------------------------------

The properties can be set on both the system-wide and database level.

The properties are static.

I believe derby.storage.indexStats.trace should be exposed - it provides valuable information when you have to debug problems with the feature. Take care of the valid values for the trace property: "none" (the default), "stdout", "log", "both".
                
> 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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