Hi,
We have row locks in our Oracle 11g jBPM database. I am still trying to figure out what action causes these locks. What I have seen so far is that there is a blocking session in our database which performs this SQL:
DELETE FROM jbpm4_execution WHERE dbid_ = :1 AND dbversion_ = :2
It seems that this SQL statement hangs (no commit or rollback is ever done) causing other SQL statements (an update in this case) to block.
I found the locked sessions using:
select INST_ID, SID, TYPE, ID1, ID2, LMODE, REQUEST, CTIME, BLOCK from gv$lock where (ID1,ID2,TYPE) in (select ID1,ID2,TYPE from gv$lock where request>0);
INST_ID SID TYPE ID1 ID2 LMODE REQUEST CTIME BLOCK
1 139 TX 65548 37132 6 0 8804 1
1 104 TX 65548 37132 0 6 7450 0
When I look in our code I think the blocking database session must be our call to org.jbpm.api.ExecutionService#endProcessInstance.
Does anyone have an idea why this could cause a lock?
We use the default Oracle JDBC driver and our Hibernate settings are:
<hibernate-configuration>
<session-factory>
<property name="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
<property name="hibernate.connection.datasource">java:/JbpmDS</property>
<property name="hibernate.format_sql">true</property>
<mapping resource="jbpm.repository.hbm.xml" />
<mapping resource="jbpm.execution.hbm.xml" />
<mapping resource="jbpm.history.hbm.xml" />
<mapping resource="jbpm.task.hbm.xml" />
<mapping resource="jbpm.identity.hbm.xml" />
</session-factory>
</hibernate-configuration>
cheers,
Edgar
