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From "C.S. Nirmal J. Fernando (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4587) Add tools for improved analysis and understanding of query plans and execution statistics
Date Fri, 25 Jun 2010 15:15:51 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

C.S. Nirmal J. Fernando updated DERBY-4587:
-------------------------------------------

    Attachment: DERBY-4587-tool-6.diff
                DERBY-4587-tool-test1.diff

Hi All,

I've created a test only to check the generation of XML files not to test the correctness
of XML values,
inside "org.apache.derbyTesting.functionTests.tests.lang.XplainStatisticsTest.java", 
you can find them in DERBY-4587-tool-test1.diff attached.

While creating the tests I found an important check for the zero columns returned 
in the sysxplain_resultsets for DDL statements is needed. DERBY-4587-tool-6.diff
included that modification as well.

Your comments are mostly welcome.

Thanks.

> 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-5.diff, DERBY-4587-tool-6.diff, DERBY-4587-tool-test1.diff,
DERBY-4587-tool.diff, Derby_Query_Plan_Screen_Shot.jpg, PostgreSQL license.jpg, Read_Me.txt,
screenshot-1.jpg, screenshot-2.jpg, screenshot-3.jpg, Simple HTML View (Pure XSL).jpg, Source.rar,
test.xml, test4.xsl, vanilla_html.xsl, xml_doc_screenshot.jpg
>
>
> 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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