[jboss-jira] [JBoss JIRA] Created: (EJBTHREE-649) Query Performance within transaction decreasing progressively when using default FlushModeType.AUTO

[Andreas Zimmer (JIRA)]

Query Performance within transaction decreasing progressively when using default FlushModeType.AUTO
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                 Key: EJBTHREE-649
                 URL: http://jira.jboss.com/jira/browse/EJBTHREE-649
             Project: EJB 3.0
          Issue Type: Bug
    Affects Versions: EJB 3.0 RC8 - FD
         Environment: WinXP SP2, Oracle 9i Enterprise Rel. 9.2.0.1.0, JBoss 4.0.4GA, EJB3.0 RC8-FD
            Reporter: Andreas Zimmer


Query Performance within a Transaction is progressively decreasing when working with EJB3.0 default FlushModeType.AUTO:

20 queries/reads within transaction - 10 msecs average per query/read 
1000 (same as before) queries/reads within transaction - 130 msecs average per query/read (factor 13+) 

With FlushModeType.COMMIT query performance within the same scenario ist constant at expected 10 msecs but FlushModeType.COMMIT imposes restrictions which our projects can't cope with. We need updates within transaction being visible in subsequent queries of the same transaction.

The case is explained in some detail in the JBoss Forum Thread as provided in JBoss Forum Reference.

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