out of memory using Postgres with Spring/Hibernate/Java

Hi,

We are currently having a problem that our Postgres DB
is throwing an SQL error which states that it's 'out
of memory'.

What we have is a DB with 1 table that has 3.9 million
records. We need to find certain records that are to
be processed by a Java App so we do a "select id from
table where type=a and condition in (1, 2) order by id
limit 2000". When this query gets executed we see the
memory on the DB Server increasing and after it has
finishes it drops a bit but we see it growing a few MB
per few minutes. This has caused an out of memory
after the system has been processing for a day or 2.
The query is heavy because of the order by but that
does not explain why the memory is increasing.

We use a DAO which extends HibernateDaoSupport and the
method (findIds) has been marked as
propagation_required. So we assume Spring manages the
transaction and thus closing of the resultset. Here's
part of the DAO method: Query q =
getSession(false).createQuery(query);
q.setMaxResults(RESULT_SIZE);
List list = q.list();

No rocketscience but somehow this causes a problem on
the DB Server.

Does anyone have an idea where to look?

Thanks,
Maarten

ps: Java stacktrace: *** [WARN 2006-03-11 20:04:26,288
main]
org.hibernate.util.JDBCExceptionReporter.logExcept
ions(JDBCExceptionReporter.java:71)
SQL Error: 0, SQLState: null
*** [ERROR 2006-03-11 20:04:26,292 main]
org.hibernate.util.JDBCExceptionReporter.logExcept
ions(JDBCExceptionReporter.java:72)
Batch entry 0 update activiteit set
activiteit_type=102, activiteit_subtype=1305,
start_dt=2006-03-11 20:03:40.940000+0100,
moeder_id=NULL, toestand=8022,
laatste_actie_dt=2006-03-11 20:03:41.012000+0100,
uiterlijke_actie_dt=2006-03-11 20:03:40.940000+0100,
pl_id=NULL, communicatie_partner=1905, nr_1=NULL,
nr_2=NULL, nr_3=NULL, nr_4=NULL, nr_5=NULL,
tekst_1=NULL, tekst_2=NULL, tekst_3=NULL,
tekst_4=NULL, tekst_5=NULL where
activiteit_id=11079994 was aborted. Call
getNextException to see the cause.
*** [WARN 2006-03-11 20:04:26,293 main]
org.hibernate.util.JDBCExceptionReporter.logExcept
ions(JDBCExceptionReporter.java:71)
SQL Error: 0, SQLState: 53200
*** [ERROR 2006-03-11 20:04:26,293 main]
org.hibernate.util.JDBCExceptionReporter.logExcept
ions(JDBCExceptionReporter.java:72)
ERROR: out of memory
*** [ERROR 2006-03-11 20:04:26,318 main]
org.hibernate.event.def.AbstractFlushingEventListe
ner.performExecutions(AbstractFlushingEventListene
r.java:277)
Could not synchronize database state with session
org.hibernate.exception.GenericJDBCException: Could
not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.handledN
onSpecificException(SQLStateConverter.java:82)
at org.hibernate.exception.SQLStateConverter.convert(
SQLStateConverter.java:70)
at org.hibernate.exception.JDBCExceptionHelper.conver
t(JDBCExceptionHelper.java:43)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(Ab
stractBatcher.java:181)
at org.hibernate.engine.ActionQueue.executeActions(Ac
tionQueue.java:226)
at org.hibernate.engine.ActionQueue.executeActions(Ac
tionQueue.java:137)
at org.hibernate.event.def.AbstractFlushingEventListe
ner.performExecutions(AbstractFlushingEventListene
r.java:274)
at org.hibernate.event.def.DefaultFlushEventListener.
onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.j
ava:730)
at org.hibernate.impl.SessionImpl.managedFlush(Sessio
nImpl.java:324)
at org.hibernate.transaction.JDBCTransaction.commit(J
DBCTransaction.java:86)
at org.springframework.orm.hibernate3.HibernateTransa
ctionManager.doCommit(HibernateTransactionManager.
java:490)
at org.springframework.transaction.support.AbstractPl
atformTransactionManager.processCommit(AbstractPla
tformTransactionManager.java:495)
at org.springframework.transaction.support.AbstractPl
atformTransactionManager.commit(AbstractPlatformTr
ansactionManager.java:468)
at org.springframework.transaction.interceptor.Transa
ctionAspectSupport.doCommitTransactionAfterReturni
ng(TransactionAspectSupport.java:258)
at org.springframework.transaction.interceptor.Transa
ctionInterceptor.invoke(TransactionInterceptor.jav
a:106)
at org.springframework.aop.framework.ReflectiveMethod
Invocation.proceed(ReflectiveMethodInvocation.java
:144)
at org.springframework.aop.framework.JdkDynamicAopPro
xy.invoke(JdkDynamicAopProxy.java:174)
at $Proxy3.invokeWithinNewTx(Unknown Source)
at nl.ictu.spg.service.workflow.ActiviteitCMP.persist
NowWithNewGebeurtenis(ActiviteitCMP.java:546)
at nl.ictu.spg.service.workflow.WorkflowActiviteit.pe
rsistNowWithNewGebeurtenis(WorkflowActiviteit.java
:320)
at nl.ictu.spg.service.workflow.berichten.LO3.LO3Beri
chtDispatcher.executeCycle(LO3BerichtDispatcher.ja
va:224)
at nl.ictu.spg.service.workflow.berichten.LO3.LO3Beri
chtDispatcher.dispatch(LO3BerichtDispatcher.java:1 77)
at nl.ictu.spg.service.workflow.berichten.LO3.LO3Beri
chtDispatcher.dispatch(LO3BerichtDispatcher.java:2 56)
at nl.ictu.spg.service.request.lo3.LO3RequestProcesso
r.runOnce(LO3RequestProcessor.java:194)
at nl.ictu.spg.service.plupdate.PlUpdateBackgroundSer
vice.main(PlUpdateBackgroundService.java:69)
Caused by: java.sql.BatchUpdateException: Batch entry
0 update activiteit set activiteit_type=102,
activiteit_subtype=1305, start_dt=2006-03-11
20:03:40.940000+0100, moeder_id=NULL, toestand=8022,
laatste_actie_dt=2006-03-11 20:03:41.012000+0100,
uiterlijke_actie_dt=2006-03-11 20:03:40.940000+0100,
pl_id=NULL, communicatie_partner=1905, nr_1=NULL,
nr_2=NULL, nr_3=NULL, nr_4=NULL, nr_5=NULL,
tekst_1=NULL, tekst_2=NULL, tekst_3=NULL,
tekst_4=NULL, tekst_5=NULL where
activiteit_id=11079994 was aborted. Call
getNextException to see the cause.
at org.postgresql.jdbc2.AbstractJdbc2Statement$BatchR
esultHandler.handleError(AbstractJdbc2Statement.ja
va:2392)
at org.postgresql.core.v3.QueryExecutorImpl.processRe
sults(QueryExecutorImpl.java:1257)
at org.postgresql.core.v3.QueryExecutorImpl.execute(Q
ueryExecutorImpl.java:334)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execut
eBatch(AbstractJdbc2Statement.java:2451)
at org.apache.commons.dbcp.DelegatingStatement.execut
eBatch(DelegatingStatement.java:294)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(
BatchingBatcher.java:57)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(Ab
stractBatcher.java:174)
... 22 more

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