单项选择题
A.The user must have been granted the DBA role.
B.The user must have been granted the switch privilege as a part of a role.
C.The user must have been granted the Resource Manager administrator privilege.
D.The user must have been granted the switch privilege by using the DBMS_RESOURCE_MANAGER_PRIVS package.
多项选择题 Immediately after adding a new disk to or removing an existing disk from an Automatic StorageManagement （ASM） instance， you find that the performance of the database decreases initially， until the addition or removal process is completed. Performance then gradually returns to normal levels. Which two activities could you perform to maintain a consistent performance of the database while adding or removing disks？（）
单项选择题 You execute the following command to enable a session in resumable mode： SQL> ALTER SESSION ENABLE RESUMABLE TIMEOUT 60； What is the impact of a timeout on the statements being suspended？（）
单项选择题 The SPFILE for the PROD database specifies the following initialization parameter values： SGA_TARGET = 2G DB_8K_CACHE_SIZE = 128M You create a tablespace named HR with the non-standard block size of 8K. Four database users are running queries on a table in the HR tablespace. These users complain that the queries are taking longer than usual to complete. While investigating the reasons for this delay， you discover that the database encounters extensive cache misses on the database buffer cache with the block size of 8K. You issue the following statement to increase the value of the DB_8K_CACHE_SIZE initialization parameter to 256M： SQL>ALTER SYSTEM SET DB_8K_CACHE_SIZE=256M SCOPE = BOTH； What is the result of this statement？（）