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https://issues.apache.org/jira/browse/DERBY-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12876551#action_12876551
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Bryan Pendleton commented on DERBY-4587:
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I've been thinking a little bit about testing. I was wondering whether we
could change the AccessDatabase class a little bit so that there is an
alternate constructor which allows a Connection to be passed in. Then,
it would be possible to extend the XplainStatisticsTest so that it invokes
the AccessDatabase class to emit the XML format of the various captured
query plans in each of the test cases, as we ran them.
What would you think about adding an alternate AccessDatabase constructor
which took a Connection rather than a jdbcUrl?
> 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, Source.rar
>
>
> 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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