No instances are showing on ESB Control

Question

Hi everyone,
I had the problem that my ESB Control was not showing any instances even though the messages were still being processed. I found a solution in another thread
ESB 10.1.3.3.1 w/ MLR #3 - no instances are showing on ESB Control
I erased all the files found in this persistence folder and I could see the instances in the ESB Control again. Since the problem occurred in our production enviroment I would really like to know the meaning of this persistence directory and the consequences of deleting the files in it.
cheers Nicolas

Answer 1

I've disabled the opmn.xml ons configuration, and removed the FastConnectioNFailover from data-source.xml etc and the problem still persists.
if I don't disable the logger, I get 150,000 messages of form .... is there any particular reason why it won't talk to the datasource. it seems to me that it can't talk down to it's datasource somehow ... but all else is working... anyone any ideas
SELECT COUNT (*) from ESB_ACTIVITY = 0.
<MESSAGE>
<HEADER>
<TSTZ_ORIGINATING>2008-02-04T16:08:29.315+00:00</TSTZ_ORIGINATING>
<COMPONENT_ID>tip</COMPONENT_ID>
<MSG_TYPE TYPE="TRACE"></MSG_TYPE>
<MSG_LEVEL>1</MSG_LEVEL>
<HOST_ID>foo.foohost</HOST_ID>
<HOST_NWADDR>10.50.0.200</HOST_NWADDR>
<MODULE_ID>esb.monitor.agent</MODULE_ID>
<THREAD_ID>65</THREAD_ID>
<USER_ID>oracleas</USER_ID>
</HEADER>
<CORRELATION_DATA>
<EXEC_CONTEXT_ID><UNIQUE_ID>10.50.0.200:70647:1202141285190:142</UNIQUE_ID>< SEQ>0</SEQ></EXEC_CONTEXT_ID>
</CORRELATION_DATA>
<PAYLOAD>
<MSG_TEXT>Sending the activity messages</MSG_TEXT>
</PAYLOAD>
</MESSAGE>