1Z0-053單項(xiàng)選擇題每日一練(2019.01.14)

Given the following RMAN commands，choose the option that reflects the order required to restore your currently operational ARCHIVELOG-mode database.（）  
a. restore database 
b. recover database 
c. shutdown immediate 
d. startup 
e. restore archivelog all
f. alter database open 

You are managing the APPPROD database as a DBA which is not using the Oracle-managed files. You plan to duplicate this database in the same system with the name DUPDB.You want to create the same directory structure for duplicate database files as of the target database. You executed the following RMAN commands：  
RMAN> CONNECT TARGET sys/sys@APPPROD RMAN> CONNECT AUXILIARY sys/sys@DUPDB RMAN> DUPLICATE TARGET DATABASE TO dupdb 
FROM ACTIVE DATABASE PASSWORD FILE SPILE 
NOFILENAMECHECK；  
What are the implications of this command？（）

You want to perform the following operations for the DATA ASM disk group：
-Verify the consistency of the disk. 
-Cross-check all the file extent maps and allocation tables for consistency. check whether the alias metadata directory and file directory are linked correctly. 
-Check that ASM metadata directories do not have unreachable allocated blocks.  
Which command accomplishes these tasks（）？

Upon starting your database， you receive the following error：  
SQL> startup ORACLE instance started. 
Total System Global Area 171581440 bytes Fixed Size 1298640 bytes Variable Size 146804528 bytes Database Buffers 20971520 bytes Redo Buffers 2506752 bytes Database mounted. 
ORA-00313： open failed for members of log group 1 of thread 1 
ORA-00312： online log 1 thread 1： ’/oracle01/oradata/orcl/redo01.log’ ORA-00312： online log 1 thread 1： ’/oracle01/oradata/orcl/redo01a.log’  
You can choose from the following steps：  
a. Restore the database datafiles. 
b. Issue the alter database clear unarchived logfile group 1 command.
c. Issue the alter database open command. 
d. Issue the alter database open resetlogs command. 
e. Recover the database using point-in-time recovery.
f. Issue the Startup Mount command to mount the database. 
g. Back up the database. 
Which is the correct order of these steps in this case？（）

As DBA for the Rebel Alliance you have decided that you need to facilitate some redundancy in your database. Using ASM， you want to create a disk group that will provide for the greatest amount of redundancy for your ASM data （you do not have advanced SAN mirroring technology available to you， unfortunately）. 
Which of the following commands would create a disk group that would offer the maximum in data redundancy？（）