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From "garpinc (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENJPA-2265) An unnecessary select statement appears to be occurring on primary key table
Date Thu, 11 Oct 2012 15:35:02 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-2265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13474237#comment-13474237
] 

garpinc commented on OPENJPA-2265:
----------------------------------

FYI: With  snapshot openjpa-2.2.1-20121010.180151-3.jar
I'm now seeing for the workaround which makes the work around unusable for that version

The instance of type "class com.cambridgesemantics.anzo.relationalreplicator.jpa.model.AnzoURIToPKImpl"
with oid "null" no longer exists in the data store.  This may mean that you deleted the instance
in a separate transaction, but this context still has a cached version.
                
> 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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