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From "Rick Curtis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENJPA-2265) An unnecessary select statement appears to be occurring on primary key table
Date Fri, 21 Sep 2012 17:57:07 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-2265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13460663#comment-13460663
] 

Rick Curtis commented on OPENJPA-2265:
--------------------------------------

Try persisting your key before the master. 

The extra select is when we cascade the relationship from Master->Key and we don't know
if the other side is new or existing.
                
> An unnecessary select statement appears to be occurring on primary key table
> ----------------------------------------------------------------------------
>
>                 Key: OPENJPA-2265
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2265
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jdbc
>    Affects Versions: 2.2.0
>            Reporter: garpinc
>         Attachments: testselect0.zip
>
>
> This issue pertains to http://openjpa.208410.n2.nabble.com/Can-someone-explain-this-OpenJPA-trace-td7580862.html
> Basically I'm seeing an unnecessary select statement of the form:
> 1487  test  TRACE  [main] openjpa.jdbc.SQL - <t 1920940938, conn 488448102> executing
prepstmnt 163450945 SELECT t0.otherField1, t0.uniqueField1 FROM KeyClass t0 WHERE t0.pk =
? [params=(long) 0]
> My application does millions of these so performance is suffering. I'll be attaching
a test case to illustrate. testselect0.zip

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