单选题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_DICTI

第1题：

Which two statements correctly describe the relation between a data file and the logical databasestructures（）

• A、An extent cannot spread across data files.
• B、A segment cannot spread across data files.
• C、A data file can belong to only one tablespace.
• D、A data file can have only one segment created in it.
• E、A data block can spread across multiple data files as it can consist of multiple operating system （OS） blocks.

第2题：

Which of the following would be affected by setting NLS_LENGTH_SEMANTICS=CHAR?（）

• A、All objects in the database
• B、Tables owned by SYS and SYSTEM
• C、Data dictionary tables
• D、NCHAR columns
• E、CHAR columns

第3题：

第4题：

Which two statements about bigfile tablespaces are true？ （）

• A、The bigfile tablespace have only one data file.
• B、The segment space management is automatic.
• C、The extent management is dictionary managed.
• D、The database can have only one bigfile tablespace.
• E、The bigfile tablespace can be converted to a smallfile tablespace.

第5题：

Which statements are true regarding the Query Result Cache？（） 

• A、 It can be set at the system， session， or table level.
• B、 It is used only across statements in the same session.
• C、 It can store the results from normal as well as flashback queries.
• D、 It can store the results of queries based on normal，temporary，and dictionary tables.

第6题：

Which is the source used by Automatic SQL Tuning that runs as part of the AUTOTASK framework? （）

• A、SQL statements that are part of the AWR baseline only 
• B、SQL statements based on the AWR top SQL identification
• C、SQL statements that are part of the available SQL Tuning Set (STS) only 
• D、SQL statements that are available in the cursor cache and executed by a user other than SYS 

第7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

第8题：

第9题：

Which two statements about the SQL Management Base (SMB) are true? （）(Choose two.)

• A、It contains only SQL profiles generated by SQL Tuning Advisor.
• B、It stores plans generated by the optimizer using a stored outline.
• C、It is part of the data dictionary and stored in the SYSAUX tablespace.
• D、It is part of the data dictionary and stored in the SYSTEM tablespace.
• E、It contains the statement log, the plan history, plan baselines, and SQL profiles.

第10题：

Which two statements are true about simple views？（）

• A、Views can be created as read only.
• B、Views are data segments like tables.
• C、Views can be created on the basis of more than one table.
• D、Data manipulation language （DML） operations cannot be performed on views.