This message means the event_realtime_table is corrupt and the IDS Event Viewer cannot save events to the MySQL database or pull data into the view.
You can correct the problem by closing the IDS Event Viewer and then stopping the MySQL service and deleting the corrupt files. To stop the MySQL service, select Start > Settings > Control Panel > Services > MySQL, and then click Stop. Next, delete the following files from the /path to Cisco IDS Event Viewer/MySQL/data/alarmDB directory:
event_realtime_table.frm
event_realtime_table.MYI
event_realtime_table.MYD
Finally, restart the Cisco IDS Event Viewer service. The Cisco IDS Event Viewer should now be able to properly store realtime events and load them into view.
Refer to Troubleshooting ->Unable to Save Events to MySQL Database
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/csids/csids8/13877_01.htm#89759