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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 Tue, 20 Jul 2010 01:35:50 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890125#action_12890125
] 

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

Yes, you're right, it is there in my jdk 1.6 environment.

I wonder if the problem is due to:

Setting property java15compile.classpath to /usr/lib/jvm/java-1.5.0-gcj-4.4/jre/lib/rt.jar

It seems that the build chose to use my GCJ version of 1.5, rather than my Sun version.

I tried forcing j15lib to point to my jdk 1.6 JRE, but then I get
JDBC interface compilation errors due to the differences between
JDBC 3 and JDBC 4.

The Derby build has become a tad complex of late, and I'm
having a bit of confusion here, but I'll continue to investigate...


> 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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