052(十四）

66、

66.You are working on an instance started using the SPFILE. You want to move the Flash Recovery Area of your database to a new location. You want the Flashback log files to be stored in the new location. 
Given below are the steps to accomplish the task in random order:
1) Shut down the instance.
2) Change the value of the DB_RECOVERY_FILE_DEST initialization parameter to a new value.
3) Execute the ALTER DATABASE FLASHBACK OFF command.
4) Start up the instance and mount the database.
5) Execute the ALTER DATABASE FLASHBACK ON command.
6) Open the database.
Select the correct order in which these tasks need to be performed.
A. 2, 1, 4, 3, 5, 6 
B. 1, 4, 3, 2, 6, 5 
C. 1, 4, 2, 6, 3, 5 
D. 3, 2, 1, 4, 5, 6 

Answer: A

67、

67.You are in the middle of a transaction updating a very important table. The machine on which a database was running reboots because of power outage. This caused a database instance failure. 
Which statement is true in this situation? 
A. The online redo log files and archived redo log files are required to accomplish the recovery 
B. The uncommitted transaction will be committed at the next startup of the database instance 
C. The uncommitted transaction is rolled back automatically at the next opening of the database 
D. The DBA has to perform the recovery on the database to recover the uncommitted transaction 

Answer: C

68、

68.View the Exhibit to examine the output produced by the following query at three different times since the database instance started and has experienced workloads of different capacities: 
SQL> SELECT substr(component, 0, 10) COMP, current_size CS, user_specified_size US 
FROM v$memory_dynamic_components 
WHERE current_size!=0; 
What do you infer from this? 
A. The database instance is running with manual PGA management. 
B. The database instance is running with manual shared memory management. 
C. The database instance has the MEMORY_TARGET value set to a nonzero value.  
D. All sessions are connected to the database instance in dedicated mode, and no RMAN or parallel query operations have been performed. 

Answer: C

69、

69.Your database instance is started using the server parameter file (SPFILE). 
You executed a command to change the value of the LOG_BUFFER initialization parameter: 
ALTER SYSTEM SET LOG_BUFFER=32M SCOPE=BOTH; 
What would be the outcome of this command? 
A. The command succeeds only if Automatic Memory Management is not enabled. 
B. The command succeeds, but you need to restart the database for changes to take effect. 
C. The command returns an error because the size of the redo log buffer cannot be changed dynamically. 
D. The parameter value is changed and it comes into effect as soon as space becomes available in the System Global Area (SGA). 

Answer: C

SQL> select NAME,ISSES_MODIFIABLE, ISSYS_MODIFIABLE from v$parameter where name like '%log_b%';

NAME        ISSES_MODI    ISSYS_MODIFIABLE
------------------------------------
log_buffer    FALSE      FALSE


FALSE 静态参数，表示下次启动才生效

70、The database instance is currently using SPFILE. View the Exhibit and examine the error that you received while running the DB Structure Integrity check.

Given below are the steps to recover from the error in random order: 
1. Shut down the instance, if not already done. 
2. Copy one of the remaining control files to a new location. 
3. Change the value of the CONTROL_FILES initialization parameter to correspond to the new location of the control files. 
4. Start up the database instance to the NOMOUNT stage. 
5. Recover the database to the point of failure of the control file. 
6. Open the database. 
Identify the correct sequence of steps? 
A. 1, 2, 4, 3, 5, 6 
B. 2, 4, 3, 5, 6; 1 not required 
C. 4, 5, 6, 2, 3; 1 not required 
D. 5, 2, 3, 4; 1 and 6 not required 

Answer: A