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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-6054) java.sql.SQLException: Exceeded maximum number of sections 32k in application with many setTransactionIsolation statements
Date Wed, 30 Jan 2013 12:03:16 GMT

     [ https://issues.apache.org/jira/browse/DERBY-6054?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kathey Marsden updated DERBY-6054:

    Issue & fix info: Workaround attached


The user was able to  work around the issue by reducing the number of setTransactionIsolation
statements by making the WAS default isolation and the OpenJPA isolation match.
The statement log showed a large number of setTransactionIsolation statements toggling from
UR to RR.

"After changing transaction isolation level on WAS datasource to be equal with SwKBT OpenJPA,
I managed to get rid of large number of transaction UR, RR calls.

WAS datasource transaction isolation level needs to match OpenJPA openjpa.jdbc.TransactionIsolation.
If not, it will invoke large number of setTransactionIsolation calls.

WAS datasurce  transaction isolation level is configurable with property webSphereDefaultIsolationLevel:

> java.sql.SQLException: Exceeded maximum number of sections 32k  in application with many
setTransactionIsolation statements
> ---------------------------------------------------------------------------------------------------------------------------
>                 Key: DERBY-6054
>                 URL: https://issues.apache.org/jira/browse/DERBY-6054
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Client
>    Affects Versions:
>         Environment: Linux vm (need to get more details).  Problem is particular to this
environment and does not fail on other hardware.
> Fri Jan 04 13:41:47 MST 2013:
> Booting Derby version The Apache Software Foundation - Apache Derby - - (1181258):
instance a816c00e-013c-074b-
> b72a-000052798332
>  sun.misc.Launcher$AppClassLoader@2e502e50
> java.vendor=IBM Corporation
> java.runtime.version=pxi32devifx-20090225 (SR9-0 +IZ44410+IZ44495)
> java.fullversion=J2RE 1.5.0 IBM J9 2.3 Linux x86-32 j9vmxi3223ifx-20090225 (JIT enabled)
> J9VM - 20090224_30451_lHdSMr
> JIT  - 20081112_1511ifx1_r8
> GC   - 200811_07
>            Reporter: Kathey Marsden
> An application that uses OpenJPA and WAS gets the exception below.
> java.sql.SQLException: Exceeded maximum number of sections 32k 
>        at org.apache.derby.client.am.SQLExceptionFactory.getSQLException(Unknown Source)

>        at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source) 
>        at org.apache.derby.client.am.Statement.executeUpdate(Unknown Source) 
>        at org.apache.derby.client.am.Connection.setTransactionIsolationX(Unknown Source)

>        at org.apache.derby.client.am.Connection.setTransactionIsolation(Unknown Source)

>        at org.apache.derby.client.am.LogicalConnection.setTransactionIsolation(Unknown
>        at com.ibm.ws.rsadapter.spi.WSRdbManagedConnectionImpl.setTransactionIsolation(WSRdbManagedConnectionImpl.java:4622)

>        at com.ibm.ws.rsadapter.jdbc.WSJdbcConnection.setTransactionIsolation(WSJdbcConnection.java:2884)

>        at org.apache.openjpa.lib.jdbc.DelegatingConnection.setTransactionIsolation(DelegatingConnection.java:257)

>        at org.apache.openjpa.lib.jdbc.DelegatingConnection.setTransactionIsolation(DelegatingConnection.java:257)

>        at org.apache.openjpa.lib.jdbc.ConfiguringConnectionDecorator.decorate(ConfiguringConnectionDecorator.java:95)

>        at org.apache.openjpa.lib.jdbc.DecoratingDataSource.decorate(DecoratingDataSource.java:100)

>        at org.apache.openjpa.lib.jdbc.DecoratingDataSource.getConnection(DecoratingDataSource.java:88)

>        at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.connectInternal(JDBCStoreManager.java:879)

>        at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.connect(JDBCStoreManager.java:864)
> Looking at the log  every time a connection is opened there are two SET CURRENT ISOLATION
STATEMENTS, presumably as the isolation is set and then again to reset it for the pool.
> There are exactly 32767 of these for the session before the failure.
> ~/repro$grep 'SET CURRENT ISO'  derby.log | grep 'Executing' |
> grep 'SESSIONID = 9' | wc
>   32767  983010 8060682
> Only the setTransactionIsolation statements do not seem to be getting garbage collected
and teh sections reused. All in all the session has hundreds of thousands of statements that
do not have a problem.
> ~/repro $ grep 'Executing'  derby.log | grep 'SESSIONID = 9' |
> wc
>  364906 30487228 297049149
> Runtimeinfo  was not revealing in terms of showing the statements building up. so there
is more investigation to do.

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