Oracle OCP 19c 认证1Z0-083考试(93-95题) #可下载

Posted 2022-12-04 wwwleoocom

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Which three are true about Optimizer Statistics Advisor? (Choose three.) A. It can be run only manually.

B.    It is part of the DBMS_ADVISOR package.

C.    It can recommend changes to improve the statistics gathering process.

D.    It always analyzes all schemas in the database.

E.    It runs automatically every night by default.

F.    It is part of the DBMS_STATS package.

Answer: CEF

(解析:DBMS_STATS 包已经扩展到包括与 advisor 交互的例程,答案 F 是对的;C 答案是会

给出建议;)

Reference: https://oracle-base.com/articles/12c/optimizer-statistics-advisor-12cr2 
54、You issued this command:

RMAN> BACKUP RECOVERY FILES;

Which two are true? (Choose two.)

A.    All Oracle recovery files not in the current FRA that have not been backed up already, are backed up.
B.    All non-Oracle files in the current FRA that have not been backed up already, are backed up.
C.    All Oracle recovery files in the current FRA that have not been backed up already, are backed up.
D.    All Oracle recovery files in the current fast recovery area (FRA) are backed up. E. These backups can be written to disk or SBT.
 
Answer: AC(45 道)

(解析:此命令用于备份磁盘上以前未备份的所有恢复文件。属于此类别的文件包括完整备
份集和增量备份集、控制文件自动备份、存档日志和数据文件副本。) 
55、Which two are true about the Oracle database methodology? (Choose two.)

A.    The Oracle Database time model should be used to find the database and instance areas most in need of tuning.

B.    Tuning activities should stop once the user is satisfied with performance.

C.    Tuning activities should stop once agreed service levels for performance have been met.

D.    The database instance memory should always be tuned before tuning any file systems.

E.    SQL statements should always be tuned before tuning any file systems.

F.    The alert log should be used to find the database and instance areas most in need of tuning.

Answer: AE

(解析:调优是基于服务条约级别的,用户的要求是无止境的;内存现在 oracle 都能够自己 调整, 所以无需太多关注;题目没有说调优的方法,所以告警日志里面的信息可以当作调整 或者故障排除的参考消息。)