1Z0-042章节练习(2019.05.05)

多项选择题
You started a long transaction. Before committing， you executed a query on one of the tables currently being modified. You received the following error： ORA-01555： snapshot too old How would you prevent such an error in the future？（）
A.guarantee undo retention
B.add one more redo log group
C.size the redo log files appropriately
D.size the UNDO tablespace appropriately
E.size the SYSTEM tablespace appropriately
F.configure an appropriate undo retention interval
G.change automatic undo management to manual
单项选择题
Your boss at Supportcenter.cn wants you to clarify Oracle 10g. Which statement regarding the usage of redo log files during instance recovery is true？（）
A.Transactions are rolled back using redo log files.
B.Transactions are rolled forward using redo log files.
C.Transactions are rolled back using redo log files and archived log files.
D.Transactions are rolled forward using redo log files and rolled back using redo log files.
多项选择题
You work as a database administrator for Certkiller .com. One of the database users accidentally deleted all the rows of a critical table and committed the delete at 1：30 p.m. You senior database administrator， Certkiller， asks you to retrieve the lost data. Which two actions would you use to ensure that there is no impact on other connected users while retrieving the deleted rows？（）
A.Use a flashback query to retrieve the rows that were deleted
B.Useconventialincremental export and then import the affected object
C.Shutdown the database inNORMALmode and restart the database instance
D.Use DBMS_META package to reconstruct the object using undo segments
E.UseTablespacePoint in Time Recovery （TSPITR） method to recover the table and the data
F.Use Oracle DataPumptwithflashback_timeoption toentableflashback export and then import the affected object.
单项选择题
A user complains that he gets the following error message repeatedly after executing some SQL statements. The error message forces the user to log off from and log on to the database to continue his work. ORA-02392： exceeded session limit on CPU usage， you are being logged off Which action would you take to increase the session limit on CPU usage？（）
A.Modify the profile assigned to the user.
B.Modify the roles assigned to the users.
C.Modify the object privileges assigned to the user.
D.Modify the system privileges assigned to the users.
E.Modify the value for the RESOURCE_LIMIT parameter in the parameter file.
单项选择题
In your Supportcenter.cn production database，you find that the database users are able to create and read files with unstructured data，available in any location on the host machine from an application. You want to restrict the database users to access files in a specific location on the host machine. What could do to achieve this？（）
A.Modify the value for the UTL_FILE_DIR parameter in the parameter file
B.Grant read and write privilege on the operating system path to the database users
C.Modify the value for the LDAP_DIRECTORY_ACCESS parameter in the parameter file
D.Modify the value for the PLSQL_NATIVE_LIBRARY_DIR parameter in the parameter file
E.Create a directory object referring to the operating system path， and grant read and write privilege on the directory object to the database users
单项选择题
The application workload on your database is same between 10 a.m. and 11 a.m. on weekdays. Suddenly you observe poor performance between 10 a.m. and 11 a.m. in the middle of the week. How would you identify the changes in configuration settings， workload profile， and statistics to diagnose the possible causes of the performance degradation？（）
A.by using the SQL access advisor
B.by using the Automatic Workload Repository report
C.by running the Automatic Database Diagnostic Monitor （ADDM）
D.by using the Automatic Workload Repository Compare Period report
E.by analyzing the output of the V$ACTIVE_SESSION_HISTORY view
单项选择题
Your boss at Certkiller .com wants you to clarify Oracle 10g. Which statement regarding the contents of the V$PARAMETER view is true？（）
A.Displays only the list of default values
B.Displays only the list of all basic parameters
C.Displays the currently in effect parameter values
D.Displays only the list of all advanced parameters
E.Displays the list of all the parameter files of a database
F.Displays the current contents of the server parameter file.
单项选择题
You are using the following command to clear the log file group： ALTER DATABASE CLEAR LOFFILE GROUP 2； In which case would the command be successful？（）
A.Group 2 is the active group.
B.Group 2 is the current group.
C.Database is in the MOUNT state.
D.Group 2 has been already archived.
单项选择题
You work as a database administrator for Certkiller .com. As a result of performance analysis， you created an index on theprod_namecolumn of the Certkiller prodtable， which contains about ten thousand rows. Later， you updated a product name in the table. How does this change affect the index？（）
A.A leaf will be marked as invalid.
B.An update in a leaf row takes place.
C.The index will be updated automatically at commit.
D.A leaf row in the index will be deleted and inserted.
E.The index becomes invalid when you make any updates
单项选择题
You have been asked to create three users， PUB1， PUB2 and PUB3， for three newly hired employees and to allocate unlimited quota on their default tablespace PUBLISHER_TBS with no other privileges. After creating the users， which method can you use for granting the required privileges？（）
A.grant CONNECT role to all of the three users
B.grant RESOURCE role to all of the three users
C.grant both CONNECT and RESOURCE role to all of the three users
D.execute ALTER USER .. QUOTA UNLIMITED ON publisher_tbs command for all of the three users
E.create role with UNLIMITED TABLESPACE system privilege and assign the role to all of the three users