单项选择题
Which statements listed below describe the data dictionary views（）
1） These are stored in the SYSTEM tablespace.
2） These are the based on the virtual tables.
3） These are owned by the SYS user.
4） These can be queried by a normal user only if O7_DICTIONARY_ACCESSIBILTY parameter is set to TRUE.
5） The V$FIXED_TABLE view can be queried to list the names of these views.
A.1 and 3
B.2， 3， and 5
C.1， 2， and 3
D.2， 3， 4， and 5
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A.CHECK
B.UNIQUE
C.NOT NULL
D.PRIMARY KEY
E.FOREIGN KEY -
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Observe the information in the columns： 1. The SGA a. Text and parsed forms of all SQL statements 2. The cursor state b. Run-time memory values for the SQL statement， such as rows retrieved 3. User-session data c. Security and resource usage information 4. The stack space d. Local variables for the process Which option has the correct match between the memory areas and their contents（）
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B.1-b， 2-c， 3-d， 4-a
C.1-a， 2-b， 3-c， 4-d
D.1-a， 2-b， 3-d， 4-c -
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Identify the memory component from which memory may be allocated for：（） 1. Session memory for the shared server 2. Buffers for I/O slaves 3. Oracle Database Recovery Manager （RMAN） backup and restore operations
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C.Database Buffer Cache
D.Program Global Area （PGA）
