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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-837) Enable optimizer trace in Derby
Date Sat, 22 Sep 2012 18:30:07 GMT

    [ https://issues.apache.org/jira/browse/DERBY-837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461237#comment-13461237

Bryan Pendleton commented on DERBY-837:

Having this in place would be a very helpful tool for working on problems like DERBY-5933,
where it isn't immediately clear why the optimizer is choosing an invalid query plan, and
able to trace its execution would be quite valuable.

Mamta, I see that in the linked email message in the description, you mentioned that you had
done a partial implementation of this feature. Do you still have that implementation available?

> 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:
>            Reporter: Mamta A. Satoor
> 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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