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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-4115) Provide a way to drop statistics information
Date Wed, 25 Apr 2012 18:20:22 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13261884#comment-13261884
] 

Mamta A. Satoor commented on DERBY-4115:
----------------------------------------

As the next step, I am looking at actually implementing the routine now that the ground work
is done. I think the implementation should be similar to update statistics, ie allow the code
to go through ALTER TABLE where permission/privilege checking, table/schema/index name validations
happen automatically and we can implement the routine through ALTER TABLE. This will require
changing ALTER TABLE syntax(same as we did for update statistics) but it will be an internal
syntax and won't be available to an end user directly. 
                
> Provide a way to drop statistics information
> --------------------------------------------
>
>                 Key: DERBY-4115
>                 URL: https://issues.apache.org/jira/browse/DERBY-4115
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.6.1.0
>            Reporter: Kathey Marsden
>            Assignee: Mamta A. Satoor
>         Attachments: DERBY4115_patch1_diff.txt, DERBY4115_patch2_diff.txt, DERBY4115_patch3_diff.txt
>
>
> Now that DERBY-269 has been resolved,  users can update statistics, but once they do,
they are committed to using and maintaining the statistics, even if it doesn't improve performance
or they have difficulty maintaining the statistics on a regular basis.  It would be good to
have a way to drop statistics information so that users could revert to the prior behavior
if needed.

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