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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 Fri, 27 Apr 2012 01:54:48 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263300#comment-13263300
] 

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

Hi Bryan, thanks for looking at the patch. 

The syntax indeed is "ALL DROP STATISTICS". It pretty much mirrors what we have implemented
for updated statistics which has the internal syntax of "ALL UPDATE STATISTICS". I am not
sure why we chose it to be that way. May be it was easier to implement it that way in the
parser and since this is internal only syntax, may be we decided to go ahead with "ALL UPDATE
STATISTICS" rather than "UPDATE ALL STATISTICS".
                
> 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,
DERBY4115_patch4_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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