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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 Thu, 29 Mar 2012 15:36:28 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241319#comment-13241319

Kim Haase commented on DERBY-5083:

Thanks, Kristian, for the info about the properties.

I was looking in java/engine/org/apache/derby/impl/sql/catalog/DataDictionaryImpl.java, and
it suggests that the default for derby.storage.indexStats.trace is "off" rather than "none"
-- is that correct? It also has a comment saying "// TODO: This property may go away in production
code." I gather that has not happened.

Also, are tracing and logging completely separate? That is, can you set derby.storage.indexStats.trace
if derby.storage.indexStats.log is not set to true? The code implies that you can, but I thought
I'd better check.

> 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:
>            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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