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Date: Mon, 21 Jul 2008 11:51:33 -0700 (PDT)
From: "Mamta A. Satoor (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-269) Provide some way to update index
 cardinality statistics (e.g. reimplement update statistics)
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    [ https://issues.apache.org/jira/browse/DERBY-269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615361#action_12615361 ] 

Mamta A. Satoor commented on DERBY-269:
---------------------------------------

Added jira entry DERBY-3788 Provide a zero-admin way of updating the statisitcs of an index

Another related jira entry DERBY-3790 Investigate if request for update statistics can be skipped for certain kind of indexes, one instance may be unique indexes based on one column.


> Provide some way to update index cardinality statistics (e.g. reimplement update statistics)
> --------------------------------------------------------------------------------------------
>
>                 Key: DERBY-269
>                 URL: https://issues.apache.org/jira/browse/DERBY-269
>             Project: Derby
>          Issue Type: New Feature
>          Components: SQL
>    Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.2.2.0, 10.3.1.4
>            Reporter: Stan Bradbury
>            Assignee: Mamta A. Satoor
>             Fix For: 10.5.0.0
>
>         Attachments: DERBY269_update_statistics_svndiff_ver1.txt, DERBY269_update_statistics_svndiff_ver2.txt, DERBY269_update_statistics_svnstat_ver1.txt, DERBY269_update_statistics_svnstat_ver2.txt
>
>
> Performance problems are being reported that can be resolved by updating the cardinality statistics used by the optimizer.  Currently the only time the statistics are guaranteed to be an up-to-date is when the index is first created on a fully populated table.  This is most easily accomplished on an existing table by using the command: 
>    alter table <table-name> compress [sequential]  
> Compress table is an I/O intensive task.  A better way to achieve this would be to re-enable parser support for the 'update statistics' command or re-implement the update in some other fashion.

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