1Z0-053考试攻略：Oracle 11g数据库管理II安全快速通过

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"Oracle 1Z0-053考试大纲详解" Oracle数据库11g Administration II的Exam-1Z0-053是针对Oracle数据库高级管理员的一项认证考试，其目的是测试考生对于Oracle 11g数据库管理和维护的理解与操作能力。该模拟考试版本（Demo）提供了部分考题，以便考生预习和准备。第1题询问了执行闪回事务（Flashback Transactions）的先决条件。正确答案包括： A. 必须启用补充日志（Supplemental log），因为闪回功能依赖于这些记录来恢复数据历史。 B. 对于主键表空间，补充日志也需要启用，这确保关键数据的完整性。 C. 数据库的保留保证（Retention Guarantee）配置，虽然不是强制，但有助于数据的完整恢复。 D. 用户必须拥有DBMS_FLASHBACK包的EXECUTE权限，以便执行相关操作。第2题场景描述了在使用RMAN（Recovery Manager）和恢复目录进行定期备份时，数据库实例在周日维护后无法打开，提示用户表空间的数据文件损坏。恢复步骤如下： 1. **Mount the database**: 首先将数据库置于装载状态，使得系统可以访问元数据，但数据文件不可用。 2. **Open the database in restricted mode**: 在装载状态下，以限制模式打开数据库，避免进一步的数据写入。 3. **Recover the damaged data file**: 使用RMAN的recover命令恢复数据文件，尝试修复或替换受损数据。 4. **Restore the data file**: 如果恢复失败，可能需要从备份中恢复完整的数据文件。 5. **Make the data file offline**: 将损坏的数据文件设置为离线状态，便于进一步操作。 6. **Copy or replace the damaged file**: 根据恢复结果，可能需要复制或替换受损的数据文件。 7. **Apply the redo logs**: 使用redo logs进行应用，确保事务的完整性。 8. **Bring the data file online**: 将数据文件重新在线，使数据库恢复正常运行。通过这两题，我们可以看到考试重点集中在数据库恢复、备份策略、权限管理和Oracle 11g特定功能的运用上。考生需要熟悉Oracle数据库架构、日志管理、RMAN工具的使用以及各种故障处理方法。备考时，不仅要了解理论知识，还要实际操作和演练，以确保在真实考试环境中能够迅速有效地解决问题。

A is incorrect because DB_RECOVERY_FILE_DEST specifies the location of the flash recovery area.

B is incorrect because the tracking file is created at the database level, not the system level.

C is incorrect because you can create the tracking file when the database is OPEN; however, to rename the

tracking file, the database must be in the MOUNT state.

QUESTION 4

You are restoring and recovering a database to a new host. What data dictionary view will you use to

identify the names of the datafiles on the new database?

A. DBA_DATAFILE

B. VJTABLESPACE

C. VJDATAFILE

D. V$DATAFILE_COPY

E. VJBACKUP DATAFILE

Answer: C

Section: (none)

Explanation/Reference:

Explanation:

V$DATAFILE lists all the datafiles for the new database, and you will use these names in the SET

NEWNAME command within the RMAN RUN block. A is incorrect because no data dictionary view called

DBA_DATAFILE exists, and even if it did exist, the view would not be available when the database is in the

MOUNT state. B, D, and E are incorrect because these views do not contain information about datafile

names on the new host.

QUESTION 5

Your flash recovery area becomes full when you are running an RMAN backup (and has not yet reached

the value specified by DB_RECOVERY_FILE_DEST). It is the destination for archived redo log files and

backups. What will happen to the database? (Choose the best answer.)

A. If you have the flash recovery area set toautoextend, the backup will continue with no problem.

B. The database will hang until you add more space to the flash recovery area.

C. RMAN will delete obsolete backups from the flash recovery area to accommodate new backups.

D. The RMAN backup will hang until you add more space to the flash recovery area.

Answer: C

Section: (none)

Explanation/Reference:

Explanation:

RMAN will delete files from the flash recovery area if they are obsolete according to the defined retention

policy.

A is incorrect because you cannot configure the flash recovery area for autoextend . B is incorrect because

the RMAN backup will fail, but the database will continue to run as long as space is available in the flash

recovery area for archived redo log files or it is an optional destination.

D is incorrect because the RMAN backup will attempt to clean up obsolete files, and failing that, it will

terminate the backup with an error message.

QUESTION 6

You want to ensure the recoverability of the recovery catalog itself. Which of the following steps should you

implement to maximize recoverability? (Choose all that apply.)

A. Configure the database for ARCHIVELOG mode.

B. Use BACKUP DATABASE PLUS ARCHIVELOG when you back up the recovery catalog.

C. Put the recovery catalog in the target database, and include a backup of the recovery catalog with every

backup.

D. Use BACKUP DATABASE PLUS ARCHIVELOG when you back up the recovery catalog.

E. Back up the recovery catalog to disk and tape after each target database backup (in other words, two

separate media types).

Answer: ABDE

Section: (none)

Explanation/Reference:

Explanation:

These are all best practices for a recovery catalog that also apply to any mission-critical database. C is

incorrect because you should never store the recovery catalog database in the target database.

QUESTION 7

For which of the following scenarios would you use user-managed incomplete recovery? (Choose all that

apply.)

A. You have lost a data file and one or more of the archived redo log files are missing.

B. Several widespread logical errors have occurred in the database in the last day.

C. You want to create a test database as of a point in time in the past.

D. You have lost a data file and you have all archived redo log files available.

E. You have lost one of the copies of the control file.

Answer: ABC

Section: (none)

Explanation/Reference:

Explanation:

A is correct because you cannot perform a full recovery with missing archived redo log files. B is correct

because incomplete recovery can be performed to bring the database back to a point in time before the

severe logical corruptions occurred. C is correct because you can easily copy the database and recover it to

a point in time in the past for regression testing.

D is incorrect because you can perform complete recovery if you have lost a datafile and have all archived

redo log files since the last backup of the datafile . E is incorrect because you do not need to perform

recovery if only one copy of the control file is missing.

QUESTION 8

You want to leverage resource consumer groups when using the Scheduler. Which Scheduler object uses

resource plans directly?

A. A lightweight job

B. Ajob class

C. Ajob chain

D. A program

Answer: B

Section: (none)

Explanation/Reference:

Explanation:

You create a job class with CREATE_JOB_CLASS and specify a resource consumer group with the

RESOURCE_CONSUMER_GROUP parameter. You can also specify a resource plan with

CREATE_WINDOW.

A is incorrect because you cannot directly link a lightweight job with a consumer group. C is incorrect

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1Z0-053考试攻略：Oracle 11g数据库管理II安全快速通过

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