早上，省社保项目组反应，数据库上有一个系统类的sql，占用资源很大，严重影响数据库性能。具体的sql为：
SELECT COUNT(*) FROM MGMT_METRIC_DEPENDENCY_DETAILS DEP, MGMT_SEVERITY SEV WHERE DEP.TARGET_GUID = :B5 AND DEP.METRIC_GUID = :B4 AND DEP.KEY_VALUE = :B3 AND DEP.EDEP_TARGET_GUID = SEV.TARGET_GUID AND DEP.EDEP_METRIC_GUID = SEV.METRIC_GUID AND DEP.DEP_KEY_VALUE = SEV.KEY_VALUE AND SEV.COLLECTION_TIMESTAMP BETWEEN :B2 AND :B1
解决办法为：
1. As part of your weekly maintenance jobs for the Oracle Management Repository, run the following
procedure to analyze all of the objects in the SYSMAN schema:
exec dbms_stats.gather_schema_stats('SYSMAN');