SolutionTo implement the solution, please execute the following steps:
1. Kill the emca command
2. Connect to the database with SYS account through SQL*Plus
SQL > alter system unquiesce;
Run the emca command at a time when there is low system usage.
For additional information on emca, please consult:
Enterprise Manager Advanced Configuration
Topic 1.2.6 Configuring Database Control During and After the Oracle Database 10g Installation
Available on OTN at:
http://download.oracle.com/docs/cd/B16240_01/doc/nav/portal_booklist.htm