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Which two statements are true regarding a PL/SQL package body？（）

A.It cannot be created without a package specification.
B.It cannot invoke subprograms defined in other packages.
C.It can contain only the subprograms defined in the package specification.
D.It can be changed and recompiled without making the package specification invalid.

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You work in a data warehouse environment that involves the execution of complex queries. The current content of the SQL cache holds the ideal workload for analysis. You want to analyze only few most resource-intensive statements. What would be your suggestion to receive recommendations on the efficient use of indexes and materialized views to improve query performance？（）

A.Run the SQL Access Advisor.
B.Run the SQL Tuning Advisor （STA）.
C.Run the Automatic Workload Repository （AWR） report.
D.Run the Automatic Database Diagnostic Monitor （ADDM）.

多項(xiàng)選擇題

Which two database operations can be performed at the MOUNT stage of database startup？（）

A.renaming of data files
B.dropping the database user
C.renaming of control files
D.multiplexing of control files
E.configuring the database in ARCHIVELOG mode

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Which two statements are true regarding a PL/SQL package body？（）

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Which two database operations can be performed at the MOUNT stage of database startup？（）

Which two database operations can be performed at the MOUNT stage of database startup？（）