OCP1Z0-053 V13.02：备考指南与SQL优化策略

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"OCP1Z0-053 V13.02" 是针对 Oracle Database 11g Administration II 的一项认证考试，该考试专注于数据库管理与优化。在备考过程中，考生需要注意的关键知识点包括： 1. 应用模块部署与SQL计划基线：在部署新应用模块时，软件供应商通常会提供相应的 SQL 计划基线，这些基线包含了针对新引入的 SQL 语句的优化方案。正确选项 A 和 C 描述了这种做法的后果： - A. 计划基线会随着时间的推移进行优化，以提升性能。 - C. 新产生的 SQL 语句首先使用已知表现良好的计划运行，直到在标准测试配置下验证其性能。 2. 动态阈值与移动窗口大小：默认系统定义的移动窗口基准大小与动态阈值有关。如果希望使用适应性阈值，考生应考虑增加窗口大小。这意味着在决定调整大小时，会考虑到以下因素： - 需要让移动窗口足够大以捕捉到适应性阈值的效果。 - 同时确保窗口大小的增加不会对系统的实时响应或资源消耗造成负面影响。 3. SQL计划优化策略：理解数据库优化器的工作原理很重要，它根据特定的SQL计划基线（如存在的话）选择执行计划，如果没有导入的计划基线，优化器会生成新的计划。 4. 性能监控与调优：考试可能还会涉及到数据库性能监控、索引管理、SQL语句分析（包括执行计划分析）以及如何根据性能指标调整参数等。 5. 安全与备份策略：虽然题目没有直接提及，但作为数据库管理员，理解数据库的安全设置、备份和恢复策略也是考试范围的一部分。备考OCP1Z0-053 V13.02时，不仅要掌握理论知识，还要熟悉实际操作和案例分析，因为考试可能包含实际问题解决的场景。通过阅读和理解提供的资料，结合实践操作和模拟试题，可以提高通过率。同时，不断回顾和复习关键概念是必不可少的。祝各位考生考试顺利！

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D. The pending area has not been created before running the I/O calibration process.

Answer: B

49.Which statement about recovering from the loss of a redo log group is true?

A. If the lost redo log group is ACTIVE, you should first attempt to clear the log file.

B. If the lost redo log group is CURRENT, you must clear the log file.

C. If the lost redo log group is ACTIVE, you must restore, perform cancel-based incomplete recovery, and

open the database using the RESETLOGS option.

D. If the lost redo log group is CURRENT, you must restore, perform cancel-based incomplete recovery,

and open the database using the RESETLOGS option.

Answer: D

50.Examine the following command:

ALTER DISKGROUP data MOUNT FORCE;

In which scenario can you use the above command to mount the disk group?

A. when ASM disk goes offline

B. when one or more ASM files are dropped

C. when some disks in a disk group are offline

D. when some disks in a failure group for a disk group are rebalancing

Answer: C

51.To control the execution of a server process when it is receiving bad packets from a potentially

malicious client, you set the SEC_PROTOCOL_ERROR_FURTHER_ACTION initialization parameter as

follows:

SQL> ALTER SYSTEM SET SEC_PROTOCOL_ERROR_FURTHER_ACTION = Drop,10;

What is the significance of this setting?

A. It terminates the client connection after 10 bad packets and the client cannot reconnect to the same

instance.

B. It terminates the client connection after 10 bad packets but the client can still reconnect, and attempt

the same operation again.

C. It terminates the client connection 10 seconds after receiving a bad packet and the client cannot

reconnect to the same instance.

D. It terminates the client connection after receiving a bad packet and the client can reconnect to the

same instance after 10 minutes.

Answer: B

52.You have the following requirements in relation to the detection of block corruption for your database

instance:

Check for logical self-consistency of data blocks when modified in memory.

Checksums are calculated before and after the block change.

Checks are performed for the lost writes to the physical standby database.

Which method would help you perform the above checks automatically?

A. Set the DB_SECUREFILE parameter to PERMITTED.

B. Set the DB_ULTRA_SAFE parameter to DATA_ONLY.

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Answer: C

56.You discover that your Recycle Bin contains two tables with the same name, MY_TABLE. You also

have a table named MY_TABLE in your schema. You execute the following statement:

FLASHBACK TABLE my_table TO BEFORE DROP RENAME TO my_table2;

What will be the result of executing this statement?

A. One of the tables is recovered from the Recycle Bin using a First In First Out (FIFO) approach.

B. One of the tables is recovered from the Recycle Bin using a Last In First Out (LIFO) approach.

C. Both the tables are recovered from the Recycle Bin with one table renamed to MY_TABLE2 and the

other to a system-generated name.

D. None of the tables are recovered from the Recycle Bin, and the statement returns an error.

Answer: B

57.Which background process of a database instance, using Automatic Storage Management (ASM),

connects as a foreground process into the ASM instance?

A. ASMB

B. PMON

C. RBAL

D. SMON

Answer: A

58.Which statement is true when Automatic Workload Repository (AWR) baselines are created using

baseline templates?

A. AWR baselines are always created as repeating baselines.

B. AWR baselines can be created on the basis of two time values.

C. AWR baselines are always created with infinite expiration duration.

D. AWR baselines are always created using the Automatic Workload Repository (AWR) retention period

as expiration duration.

Answer: B

59.You have not configured Oracle Managed Files (OMF) in your database. You do not want to scan the

entire datafile every time an incremental backup is performed. You decide to enable the block change

tracking feature. Which statement should you use to enable the block change tracking feature?

A. ALTER DATABASE ENABLE BLOCK CHANGE TRACKING;

B. ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING USING FILE <path>;

C. ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE <path>;

D. ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING;

Answer: C

60.For which two situations would you use functionality provided by the Resource Manager? (Choose

two.)

A. setting idle timeout limits on resource plans

B. saving storage space by using compressed backup sets

C. creating jobs that will run automatically at a scheduled time

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D. assigning priorities to jobs to manage access to system resources

E. creating alerts to perform notification when tablespaces are low on available space resources

Answer: AD

61.Which of the following advisors within the Oracle advisory framework will analyze a single SQL

statement and make recommendations for performance improvement?

A. SQL Repair Advisor

B. SQL Optimizer

C. SQL Access Advisor

D. SQL Tuning Advisor

Answer: D

62.You want to convert your existing non-ASM files to ASM files for the database PROD. Which method

or command would you use to accomplish this task?

A. Data Pump Export and Import

B. conventional export and import

C. the CONVERT command of RMAN

D. the BACKUP AS COPY. command of RMAN

Answer: D

63.Which method would you use to undo the changes made by a particular transaction without affecting

the changes made by other transactions?

A. point-in-time recovery

B. execute the ROLLBACK command with transaction number

C. flashback the database to before the transaction was committed

D. determine all the necessary undo SQL statements from FLASHBACK_TRANSACTION_QUERY and

use them for recovery

Answer: D

64.You performed an incomplete recovery and opened the database with the RESETLOGS option. The

LOG_ARCHIVE_FORMAT parameter is set to 'ora_%t_%s_%r.log'. Which statement regarding the

archived redo log files, created in an earlier incarnation of the database, is true?

A. The archived redo log files will be overwritten.

B. The archived redo log files are deleted automatically.

C. The archived redo log files should be moved to some other location.

D. The archived redo log files are still maintained because the file names are unique.

Answer: D

65.An online tablespace, TEST_TBS, is full and you realize that no server-managed tablespace threshold

alerts were generated for the TEST_TBS tablespace. What could be the reason, if the TEST_TBS

tablespace does not include autoextensible data files?

A. TEST_TBS is a small file tablespace.

B. TEST_TBS is a bigfile tablespace (BFT).

C. TEST_TBS is the default temporary tablespace.

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