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Running OS command using OEM 11gR1


I have installed OEM 11gR1 on linux 64bit machine and have applied all recommended patches on top of it. Everything worked out fine till i got to the part of configuring my database alert.

Database Instance: UAT > All Metrics > Tablespace Space Used (%) > Tablespace Name APPS_UNDOTS1 >

Jun 14, 2012 1:31:38 PM User Action SYSTEM SYSMAN initiated a manual reevaluation of the alert.
Jun 8, 2012 1:13:36 PM Corrective Action <SYSTEM> Execution created for Corrective Action INITIATE_SMS.
Jun 8, 2012 1:13:36 PM Corrective Action <SYSTEM> Another Corrective Action INI not run since there is an existing running execution of CA INITIATE_SMS.
Jun 8, 2012 12:50:05 PM <SYSTEM> Tablespace APPS_UNDOTS1 is 98 percent full
Jun 8, 2012 12:40:05 PM <SYSTEM> Tablespace APPS_UNDOTS1 is 91 percent full

Based on some tablespace criteria i want the system to:

1) generate a corrective action which is not happening (note that on line 2 above it seems like a corrective action was initiated but i don't know how this happened and this is the only occurrence)
2) run an OS command when the alert is initiated to


1) why is the system not generating any corrective actions
2) how can i set OEM to run an OS command

Thank you for your help
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