You lost the index tablespace in your database. You decided to re­create the index tablespace and the indexes in the tablespace. 
What methods can you use to re­create the indexes？（）

单项选择题Youlosttheindextablespaceinyourdatabase.Youarenotabletousetablespacepoint­in­timerecoveryontheindextablespace.Whatcouldbethereasonforthis？（）

A.The index tablespace contains bitmap indexes.
B.The index tablespace contains more than one data file.
C.The index tablespace supports only complete recovery.
D.The index tablespace is not a dictionary­managed tablespace.
E.There is a dependency relationship between a table and its indexes.

单项选择题In your database， online redo log files are multiplexed and one of the members in a group is lost due to media failure.  How would you recover the lost redo log member？（）

A.import the database from the last export
B.restore all the members in the group from the last backup
C.drop the lost member from the database， and then add a new member to the group
D.restore all the database files from the backup， and then perform a complete recovery 
E.restore all the database files from the backup， and then perform an incomplete recovery

单项选择题A user executes a query on the EMP table， which contains thousands of rows， to get details about employees in one of the departments. The user receives the following error： SQL> SELECT ename FROM emp WHERE deptno=10 ORDER BY sal SELECT ename FROM emp WHERE deptno=10 ORDER BY sal  *  ERROR at line 1：  ORA­01157： cannot identify lock data file 201 ­ see DBWR trace file  ORA­01110： data file 201： ’ u01 app oracle oradata orcl temp01.dbf’  What is a possible reason？（）

A.The tempfile belonging to the default temporary tablespace is missing.
B.The database is opened in restricted mode， so queries are not allowed.
C.The default temporary tablespace required to execute the query is offline.
D.The default temporary tablespace required to execute the query is dropped.
E.The default temporary tablespace required to execute the query is read­only.

多项选择题Lastnight，amediafailurecausedthelossofatemporaryfilethatbelongstoyourdatabase.Whichtwothingsmayhappenthismorningwhenyoutrytoopenyourdatabase？（）

A.The database opens normally.
B.The database prompts for a database recovery.
C.The database writer writes to a trace file， indicating that the temporary file is not found.
D.The database gets mounted and throws an error indicating that the temporary file requires recovery.

单项选择题Whilesettingupthethresholdsfortablespacespaceusagemetricsforoneofyourtablespaces，youdefinethecriticalthresholdas60%andwarningthresholdas75%.Whatwouldbetheresultofthissetting？（）

A.It would result in an error because the warning threshold cannot be more than the critical threshold.
B.The warning threshold is ignored and alerts would be generated when space usage exceeds the critical threshold.
C.The critical threshold is ignored and alerts would be generated when space usage exceeds the warning threshold.
D.Both threshold values are used and alerts are generated when space usage exceeds the respective threshold values.