单项选择题 Asadatabaseadministratoryouspendalotoftimeobservingandsettingvariousstorageparametervaluesforyourapplicationtablesinordertogainperformancebenefits.Whichtaskwouldyouperformtoreducethisoverhead？（）

多项选择题 Exhibit： View the Exhibit to see the structure of the EMPLOYEES and DEPARTMENTS tables.  Your organization plans to dissolve the department with department ID 30. You execute the following command to delete rows from the DEPARTMENTS table： SQL>delete from DEPARTMENTS where DEPT_ID = 30；  The command fails and displays the following error：  ERROR at line 1：  ORA-02292： integrity constraint （HR.SYS_C005374） violated - child record found Which two actions would you take to overcome this error？（）

单项选择题 Yourdatabaseperformancehasdegradedduetofrequentcheckpointing.Whatwouldyoudointhisscenario？（）