多項(xiàng)選擇題

You work as a database administrator for Supportcenter.cn. 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， SupportCenter， 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.

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單項(xiàng)選擇題

You work as a database administrator for Supportcenter.cn. When you tried to connect to the database， you received the following error：
ERROR：
ORA-12541：TNS：no_listener
You found that the listener is not running on the server， so you issued the following command in the Listener Control utility to start the listener.
lsnrctl>START
What statement is true？（）

A.It would attempt to start the default listener
B.It would start the most recently created listener.
C.It would display an error with a message asking for the listener name to be specified.
D.It would show you a list of listeners and prompts for the listener name that you want to start.

單項(xiàng)選擇題

You execute the following command in your Supportcenter.cn production database to change the width of the CUST_NAME column of the CUSTOMERS table： ALTER TABLE customers
MODIFY （cust_nameVARCHAR2 （40））
/
When you execute the command， it displays the following error message：
ERROR at line 1：
ORA-00054： resource busy and acquire with NOWAIT specified
What could be the reason for the error message？（）

A.The database instance is not available.
B.The ALTER TABLE command does not have WAIT option
C.The table or a row in the table is currently locked by another user session.
D.The database instance is busy processing other user sessions commands.
E.The CUSTOMERS table has no long running query active at the time when this request is made.
F.The server process executing the ALTER TABLE command is busy with another command execution

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