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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (DERBY-4934) Provide automatic update and creation of index cardinality statistics (istat)
Date Thu, 26 May 2011 09:53:48 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4934?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kristian Waagan closed DERBY-4934.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 10.8.1.2

The feature has been implemented and delivered as part of the 10.8 release.
Closing issue.

> Provide automatic update and creation of index cardinality statistics (istat)
> -----------------------------------------------------------------------------
>
>                 Key: DERBY-4934
>                 URL: https://issues.apache.org/jira/browse/DERBY-4934
>             Project: Derby
>          Issue Type: Task
>          Components: SQL, Store
>    Affects Versions: 10.8.1.2
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>             Fix For: 10.8.1.2
>
>
> Derby has been having problems with stale index cardinality statistics causing performance
degradation because the optimizer picks a sub-optimal plan.
> This master JIRA issue tracks the addition of a feature that will automatically update
and create index cardinality statistics.
> Note: For brevity I have decided to call the the feature istat during development :)

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