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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/swishey">Sash K</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/563167#563167">View the full discussion</a>
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<div class="jive-rendered-content"><blockquote class="jive-quote"><blockquote class="jive-quote">You mentioned earlier that removing all the indexes in the jbpm_job table  greatly reduces blocking issues. Are these numbers produced without indexes? </blockquote></blockquote><p>Yep, all the numbers are produced without indexes on the jbpm_job table.</p><blockquote class="jive-quote"><p>What about Oracle, does it perform better or worse without indexes in the job table?</p></blockquote><p>On Oracle the indexes are in place.  I will remove the indexes and run a test.  Will let you know as soon as have the results.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p>Do you believe the engine would be better off without them? </p></blockquote><p>Looking at how the jbpm_job table is utilized, yes, I think these  specific indexes can be removed.  Just to clarify.  From what I have seen in <strong>our use-case</strong>, under normal circumstances the jbpm_job table has very few entries at any point in time. Seems like entries are added and removed constantly. That being the case, I'm not sure I can see a benefit of spending the extra time/resources maintaining indexes which are never utilized. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>By the way, this is as good a time to explain the use-case that is failing for us.   We have a workflow with three steps synchronous steps.  The first step takes a couple to a few hundred milliseconds to complete, the second step can take anywhere from 5 to 30 seconds to complete and then the last step usually takes a half a second.    When I mentioned jobs earlier, I was referring to workflows contained the three steps just mentioned. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p> At some point we <a class="jive-link-external-small" href="https://jira.jboss.org/browse/JBPM-2094">added indexes</a> to other tables because Oracle deadlocked without them.</p></blockquote><p>I'm missing something, but can't seem to understand how lack of an index can play a role in a deadlock here.  I can see how full table scans on a table with a lot of data like jbpm_log can produce long delays and heavy load on db, but a deadlock seems kind a weird.  </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you for taking the time to look at this issue! </p></div>
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