单项选择题

You backed up the control file to trace. Which statement is true about the trace file generated？（）

A.The trace file is in binary format.
B.The trace file has a SQL script to re-create the control file.
C.The trace file is a backup set created during the backup of the control file.
D.The trace file contains the instructions to manually re-create the control file.
E.The trace file is an image copy of the control file created during the backup of the control file.

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单项选择题

User A executes the following command to update the TRANS table） SQL> UPDATE B.trans SET tr_amt=tr_amt+500 WHERE c_code=’C005’；
Before user A issues a COMMIT or ROLLBACK command， user B executes the following command on the TRANS table：
SQl> ALTER TABLE trans MODIFY （tr_type VARCHAR2 （3））；
What would happen in this scenario？（）

A.The transaction for user A is rolled back.
B.The ALTER TABLE command modifies the column successfully.
C.The ALTER TABLE command fails due to the resource being busy.
D.The ALTER TABLE command waits until user A ends the transaction.

多项选择题

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.

单项选择题

Which statement is true about the loss of system-critical data files in ARCHIVELOG mode？（）

A.The data files can be recovered till the last committed transaction.
B.The data files can be recovered without shutting down the database.
C.The data file is taken offline automatically； the database remains open.
D.The data files can be recovered to the time of the most recent backup.