Hello,
It is the second time I see error message from our disp+work process, after our week end offline backups.
In the db alert log, we have:
Sat Jun 23 23:28:31 2012
QMNC started with pid=25, OS id=3866
Completed: ALTER DATABASE OPEN
ARC3: Archival started
ARC0: STARTING ARCH PROCESSES COMPLETE
Starting background process CJQ0
Sat Jun 23 23:28:32 2012
CJQ0 started with pid=29, OS id=3886
Setting Resource Manager plan SCHEDULER[0x3DCFF]:DEFAULT_MAINTENANCE_PLAN via scheduler window
Therefore the db is opened correctly at 28.
In sm21, we have, for three work processes:
23:29:25 DIA 000 BY 0 > ORA-12170: TNS:Connect timeout occurred
...
23:34:10 DIA 000 Q0 1 Start Workproc 0, 17 times since system startup. PID 5247
23:34:10 DIA 005 Q0 1 Start Workproc 5, 17 times since system startup. PID 5248
23:34:10 DIA 007 Q0 1 Start Workproc 7, 17 times since system startup. PID 525
Just to avoid future questions, the db and the sap as are on the same host.
Therefore there is no network connection needed for these connections.
How can I diagnose why the work process can not connect to the db even though it is opened?
What are the most common causes for that kind of problem?
Thanks in advance for your help.