單項選擇題

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.

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單項選擇題

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

單項選擇題

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.

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你可能感興趣的試題

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？ （）

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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？（）