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单项选择题The EMPLOYEES table has six indexes and DML operations are slow. Which command begins monitoring the EMPLOYEE_IDX_FK index to determine whether it has been used by an execution plan？（）

A、ALTER TABLE employees monitor index employee_idx_fk; 

B、ALTER INDEX employee_idx_fk monitoring on; 

C、ALTER TABLE employees monitor all indexes; 

D、ALTER INDEX employee_idx_fk monitoring usage; 

  • D

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