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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-837) Enable optimizer trace in Derby
Date Mon, 24 Sep 2012 18:19:07 GMT

     [ https://issues.apache.org/jira/browse/DERBY-837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mamta A. Satoor updated DERBY-837:
----------------------------------

    Attachment: enableOptimizerTraceHacksvnstat.txt
                enableOptimizerTraceHacksvndiff.txt

Brian, actually I found these over 6 and 1/2 yr old svn diff and svn stat on my computer for
this jira. Can't recall much what I did without looking into it but I thought I would share
it anyways if it is of any help.
                
> Enable optimizer trace in Derby
> -------------------------------
>
>                 Key: DERBY-837
>                 URL: https://issues.apache.org/jira/browse/DERBY-837
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.2.1.6
>            Reporter: Mamta A. Satoor
>         Attachments: enableOptimizerTraceHacksvndiff.txt, enableOptimizerTraceHacksvnstat.txt
>
>
> Derby engine has code to produce trace for optimization phase ie various plans considered
by the optimizer for a query. This trace however does not get produced because there is no
way to turn the trace on. When someone does work on providing a way to enable the optimizer
trace, we will also need to decide in what format this trace should be presented. Further
information on this issue can be found at http://article.gmane.org/gmane.comp.apache.db.derby.devel/12288

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