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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 Apr 2010 14:50:25 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858301#action_12858301
] 

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

I think that we should avoid changing the schema of the XPLAIN tables.

For the time being, can we pursue an implementation where the XML
generation is done in the client side of the tool, perhaps something like:

  SELECT '<result_set>'||
              '<type>'||op_identifier||'</type>'||
              '<no_opens>'||no_opens||'</no_opens>'||
              ... repeat for the other columsn from sysxplain_resultsets...
              '</result_set>'
   FROM xxx.sysxplain_resultsets WHERE ...

Would an approach like this work to generate the XML format of the query plan data?

> 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: Bryan Pendleton
>         Attachments: Derby Query Plan Screen Shot 2.jpg, 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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