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？（）

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.

单项选择题Users are performing a large volume of inserts and deletes on the application tables in the APPS tablespace. You observe that there are several warning alerts being generated for the APPS tablespace space usage metrics. Currently， the warning threshold for the tablespace space usage metrics is set to 70%.  To make the generated alerts more useful as a problem identification tool， you want to reduce the frequency of alert generation for the tablespace space usage metrics for the APPS tablespace. What should you do？（）

A.disable SQL tracing for theAPPS tablespace
B.disable logging attribute for the APPS tablespace
C.modify the tablespace to be a dictionary­managed tablespace
D.increase the critical threshold value for the tablespace space usage metrics for the APPS tablespace
E.increase the warning threshold value for the tablespace space usage metrics for the APPS tablespace

多项选择题Intheparameterfileoftheproductiondatabase，theBACKGROUND_DUMP_DESTparameterissetto$ORACLE_HOME users.Whichtwotypesoffileswouldyoufindinthislocation？（）

A.the alert log file
B.the core dump files
C.the change tracking file
D.the user session trace files
E.the database audit trail files
F.the background process trace files

单项选择题In your test database， you find that a user’s session is executing a lot of SQL statements， resulting in the generation of a large number of trace files. While investigating the reason， you find that SQL trace has been enabled at the instance level.  You want to disable SQL trace， remotely， only for that user session to reduce the volume of trace data being generated.  How do you achieve this objective？（）

A.by setting the SQL_TRACE parameter to FALSE in the parameter file
B.by using DBMS_MONITOR.SESSION_TRACE_DISABLE to disable the tracing for the user session
C.by setting the SQL_TRACE parameter to FALSE by using the ALTER SYSTEM command in the user session
D.by setting the SQL_TRACE parameter to FALSE by using the ALTER SESSION command in the user session