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When a plan's history gets long, it helps to be able to clear out any old ones that you don't need to see anymore. Use the following scripts rather than deleting them one at a time via Enterprise Manager. These will give you a count of each and the ability to delete based on date.
Get the count for each plan and its ID:
SELECT count(*),plan_name,plan_id FROM sysdbmaintplan_history GROUP BY plan_name,plan_id
Delete based on date across all plans:
delete from sysdbmaintplan_history where end_time <='2002-04-10 19:36:43.410'
Deletes based on date and plan name:
delete from sysdbmaintplan_history where end_time <='2002-04-10 19:36:43.410' and plan_name like 'ABC%'
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This was first published in April 2003