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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4587) Add tools for improved analysis and understanding of query plans and execution statistics
Date Sun, 18 Jul 2010 17:04:49 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889636#action_12889636
] 

Bryan Pendleton commented on DERBY-4587:
----------------------------------------

Hi Nirmal, I'm having trouble getting the latest patch to build. I think
I'm not getting xalan.jar into the classpath properly. Are there any
special build instructions for this patch? What do you have your
CLASSPATH set to when you build the patch?

The errors I get are, e.g., 


    [javac] /home/bpendleton/src/derby/trunk/java/testing/org/apache/derbyTesting/functionTests/tests/lang/XplainStatisticsTest.java:2039:
cannot find symbol
    [javac] symbol  : variable XPathResult
    [javac] location: class org.apache.derbyTesting.functionTests.tests.lang.XplainStatisticsTest
    [javac]         					XPathResult.UNORDERED_NODE_ITERATOR_TYPE));


> 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: basic_html-2.2.jpg, basic_html-2.3.jpg, basic_html-2.jpg, basic_html-3.jpg,
basic_html-4.1.jpg, basic_html-4.2.jpg, 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-7-b.diff, DERBY-4587-tool-7.diff, DERBY-4587-tool-8.diff, DERBY-4587-tool-9.1.diff,
DERBY-4587-tool-9.2.diff, DERBY-4587-tool-9.3.diff, DERBY-4587-tool-9.4.diff, DERBY-4587-tool-9.diff,
DERBY-4587-tool-test1.diff, DERBY-4587-tool-test2.diff, DERBY-4587-tool.diff, derby-logo.png,
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,
vanilla_html.xsl, vanilla_html.xsl, vanilla_html.xsl, vanilla_html.xsl, xml_doc_screenshot.jpg,
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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