单项选择题
A.Automatic statistics collection is stopped for the CUSTOMERS table.
B.Statistics for the CUSTOMERS table are locked and cannot be overwritten.
C.Existing statistics for the CUSTOMERS table become unusable for the query optimizer.
D.Subsequently， statistics gathered on the CUSTOMERS table are stored as pending statistics.
多项选择题 Whichtwostatementsaretrueaboutstandarddatabaseauditing（）
单项选择题 To make audit information more productive， the DBA executes the following command before startingan audit operation： SQL> ALTER SYSTEM SET AUDIT_TRAIL=DB，EXTENDED SCOPE=SPFILE； Which statement is true regarding the audit record generated when auditing starts after restarting thedatabase（）
单项选择题 You execute the following command toauditdatabase activities： SQL>AUDITDROP ANY TABLE BY scott BY SESSION WHENEVER SUCCESSFUL； What is the effect of this command（）