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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4587) Add tools for improved analysis and understanding of query plans and execution statistics
Date Tue, 15 Jun 2010 18:01:37 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879045#action_12879045

Rick Hillegas commented on DERBY-4587:

Thanks, Nirmal. These look good. In particular, I like seeing the ability to collapse and
expand nodes. I was a little puzzled by the lack of a top level level, root node. Ultimately,
I would expect that at run-time, the tuples would flow out of a single root node at the top.

This visualization is an improvement over what you can do with xml documents in Firefox today:

1) The visualization looks cleaner--it doesn't have the distracting xml tags mixed in with

2) Probably this approach will work in a broader range of browsers besides Firefox.

I was wondering about how hard a different visualization would be: Instead of a structure
which looks like a folder tree, how about something which looks more like a left-deep tree?
That's what Derby query plans are today. Extra credit if you could expand and collapse a single
node without forcing everthing to the left to expand and collapse at the same time.


> Add tools for improved analysis and understanding of query plans and execution statistics
> -----------------------------------------------------------------------------------------
>                 Key: DERBY-4587
>                 URL: https://issues.apache.org/jira/browse/DERBY-4587
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL, Tools
>            Reporter: Bryan Pendleton
>            Assignee: C.S. Nirmal J. Fernando
>         Attachments: Derby Query Plan Screen Shot 2.jpg, DERBY-4587-tool-2.diff, DERBY-4587-tool-3.diff,
DERBY-4587-tool-4.diff, DERBY-4587-tool.diff, Derby_Query_Plan_Screen_Shot.jpg, PostgreSQL
license.jpg, Read_Me.txt, screenshot-1.jpg, screenshot-2.jpg, Source.rar, test.xml, test4.xsl
> I think it would be great to see some work in the area of tools for helping
> with the analysis of complex query execution. Quite frequently, users of
> Derby have trouble comprehending (a) how their query is being translated
> into a query plan by the optimizer, and (b) what the execution-time resource
> usage of the various parts of the query is.
> There are low-level features in Derby which capture this information and
> record it, such as logQueryPlan, and the XPLAIN tables, but there is a lot
> of opportunity for designing higher-level tools which can process the query
> plan and execution statistics information and present it in a more
> comprehensible fashion. 

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