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<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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Re: JBPM 3.2.5,MSSQL 2005 - blocking in JBPM_JOB table
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created by <a href="http://community.jboss.org/people/alex.guizar%40jboss.com">Alejandro Guizar</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/560975#560975">View the full discussion</a>
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<div class="jive-rendered-content"><blockquote class="jive-quote"><p>Is it safe to to set transaction isolation level to READ_UNCOMMITTED? </p></blockquote><p>No, it is not. HSQLDB supports read-uncommitted isolation only and jBPM exhibits erratic behavior in concurrent processes, particularly in process variables and join nodes. Apart from HSQLDB, jBPM is <a class="jive-link-external-small" href="http://hudson.jboss.org/hudson/view/jBPM/job/jbpm3-db/">continuously tested</a> with READ_COMMITTED isolation.</p><blockquote class="jive-quote"><p>Is there another, safer solution to this problem?</p></blockquote><p>Yes. Try a <a class="jive-link-external-small" href="https://repository.jboss.org/nexus/content/groups/public/org/jbpm/jbpm3/jbpm-distribution/3.2.9/">newer jBPM version</a>. At least <a class="jive-link-external-small" href="https://jira.jboss.org/browse/JBPM-2790">one fix</a> has gone towards improving job execution.</p><blockquote class="jive-quote">Looks like the issue is with having a lot jobs that execute quickly,  which results in a lot of inserts and deletes, which then results in a  lot of updates to the indexes.  Having removed all the indexes in the  jbpm_job table has greatly reduced blocking issues, but not eliminated  them. Is there anyway to configure jbpm not to delete jobs, but just mark them as complete?</blockquote><p>No, but it would make a fine addition. At some point I thought of a configuration switch to delete process instances once they finished, to avoid filling up the database. Along with a switch to <em>not</em> delete jobs and a procedure to clean up old jobs and, optionally, process instances, jBPM would have a complete  cleaning solution.</p></div>
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