Oracle 10g OCP 042 题库 1-30 题 共168题，Checkpoint 之前的数据已经写入到数据文件。 所以用restore 就可以恢复。 而checkpoi
声明：对于答案的相关的说明，是个人对Oracle的理解。
1. Because of a power outage,instance failure has occurred. From what point in the redo log does recovery begin and where does it end?
A. Current redo log and inactive redo log
B. Checkpoint position to end of redo log
C. Beginning of redo log to end of redo log
D. All redo logs before the point of last commit
E. Beginning of redo log to checkpoint position.
答案B. Checkpoint 之前的数据已经写入到数据文件。 所以用restore 就可以恢复。 而checkpoint之后的数据没有写入到数据文件，所以需要进行recovery。 Recovery时，对于已经commit的数据，前滚写入到数据文件。 没有commit的数据，进行回滚。
2. Which two operations can be flashed back using the flashback technology? (choose two)
A. Drop user smith;
B. Drop table employees;
C. Drop tablespace users;
D. Alter table sales_rep drop partition p1;
E. Alter table employees drop column desig_id;
答案：AB。
Oracle Flashback 技术总结
3. You have to shut down the database instance with the abort option because of a hardware failure. Which statement is true about the subsequent opening of the database?
A. The database would open normally.
B. The database would not open,and it would stop at mount stage.
C. The database would open alter automatically performing instance recovery.
D. The database would not open, and have to perform database recovery to open it.
答案： C.
如果实例异常关闭（宕机，shutdown abort），并且数据文件，控制文件，联机日志都没有丢失。在下次启动时，要利用联机日志的内容进行恢复，这种恢复就是实例恢复（Instance Recovery）。
Instance Recovery 主要包括3个阶段：
1） 根据联机日志内容进行Rollover。
2） 打开数据库，，提供服务
3） SMON 或者用户进程进行Rollback。
4. 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 scripts 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 the control file.
答案： B
联机文档：
An alternative to the CREATE CONTROLFILE statement is ALTER DATABASE BACKUP CONTROLFILE TO TRACE, which generates a SQL script in the trace file to re-create the controlfile
5. While running the Oracle Universal Installer on a Unix platform to install Oracle Database 10g software,you are prompted to run orainstRoot.sh. What does this scripts accomplish?
A. It creates the pointer file.
B. It creates the base directory.
C. It creates the inventory pointer file.
D. It creates the Oracle user for installation.
E. It modifies the Unix kernel parmeters to match Oracle's requirement.
答案： C
可以查看$ORACLE_BASE/oraInventory/orainstRoot.sh 脚本的内容。该脚本实际上完成了以下工作：
（1）创建software inventory location pointer file: /etc/oraInst.loc，内容为
inventory_loc=$ORACLE_BASE/oraInventory
inst_group=oinstall
修改该文件属性:chmod 644 /etc/oraInst.loc
（2）创建inventory directory: $ORACLE_BASE/oraInventory
修改文件属性： chmod -R 770 $ORACLE_BASE/oraInventory
chgrp oinstall $ORACLE_BASE/oraInventory
oraInventory目录是用来存储oracle安装的所有软件组件的信息的，每个组件可能占用150k的空间.
6. While setting up an Oracle database for one of your critical applications, you want to ensure that the database is backed up at regular intervals without your intervention(介入). What should you do to achieve the objective?
A. Configure the database to run in archivelog mode.
B. Configure the Flash recovery area to enable automatic database backup.
C. Schedule the database backup using DBMS_JOB package after creating the database.
D. Schedule the database backup using recovery manager(RMAN) commands after creating the database.
E. Schedule the database backup using Database Configuration Assistant(DBCA) while creating the database.
答案：E.
刚看到这个答案的时候，以为答案有问题。Google一下，真有。 我们注意看题目，在安装数据库的时候，确保数据库在没有干预的情况下规则的备份。 只有E中的DBCA工具合适了。 而且DBCA 还真有这个功能(玩了几年Oracle，都没有留意到，杯具中...)
7. The application development team has developed PL/SQL procedures and functions for different purposes and calls them as and when required. The loading of individual procedures or functions into memory degrades performance with every call. Also, it causes a security problem for individual subprograms and loss of program units when the whole system is transported into a new location. Which method would you recommend to the application developers to solve this problem?
A. Avoiding the use of cursors in the subprograms.
B. Using anonymous（匿名） PL/SQL blocks instead of subprograms.
C. Referring to views instead of tables inside the subprograms.
D. creating PL/SQL packages to include interrelated(相关关联) subprograms.
答案：D.
8. View the Exhibit.
Your Oracle 10g database has 6 tablespaces in which:
-TEMP is the default temporary tablespace
- UNDOTBS1 is the default undo tablespace
- USERS is the default permanent tablespace
In this database, which three tablespaces can be made offline? (Choose three.)
A) TEMP
B) PROD
C) USERS
D) SYSAUX
E) SYSTEM
F) UNDOTBS1
答案: BCD。
可以参考在线文档中 Overview of Tablespaces 小节的内容。
9. The junior DBA in your organization has accidentally deleted the alert log file. What will you do to create new alert log file?
A. Create the new text file as alert.log
B. You have to recover the alert log file from the valid backup.
C. Change the value for the BACKGROUND_DUMP_DEST parameter.
D. No action required. The file would be created automatically by the instance.
答案： D.
10. While planning to manage more than one database in your system,you perform the following activities:
（1） organize different categories of files into independent subdirectories.
（2） Use consistent naming convention for database files.
（3） Separate administrative information pertaining to each database.
Which option corresponds(一致) to the type of activities performed by you?
A. Oracle Managed Files.
B. Oracle Grid Architecture.
C. Optimal Flexible architecture.
D. Oracle database architecture.
答案：C
Optimal Flexible Architecture
