1Z0-052 中英文解析

Which two statements are true about the Automatic Workload Repository (AWR)? (Choose two.)

A. All AWR tables belong to the SYSTEM schema

B. The AWR contains system wide tracing and logging information

C. The snapshots collected by the AWR are accessible through data dictionary views

D. The snapshots collected by the AWR are used by self-tuning components in the databas

哪两句是正确的关于自动负载知识库(AWR)?(选择两个)

A. 所有的AWR表属于SYSTEM用户

B. AWR包含系统跟踪信息个登录信息

C. AWR收集的快照可通过数据字典访问

D. AWR收集的快照被数据库的自我调优组件使用

A错误,AWR属于sysman并存储在sysaux表空间

B错误,这是ADR的功能

C正确,dba_hist_snapshot就可以查询

D正确,AWR是所有自我管理功能的基础

知识点:AWR:Automatic Workload Repository,自动工作负荷知识库

1.为SYSAUX表空间中的一组表和其他对象而存在

2.统计信息收集的级别由实例参数STATISTICS_LEVEL控制,有三种值:

BASIC:几乎禁用收集所有统计信息。

TYPICAL:默认级别,允许收集正常调整所需的所有统计信息,同时不会收集对性能有不良影响的统计信息集合。

ALL:收集与SQL语句执行相关的、极其详细的统计信息。

3.统计信息在内存中累积,由MMON进程定期(默认为每小时一次)写入磁盘,也就是写入AWR,称为一次AWR快照

4.AWR配置都是通过dbms_workload_repository包进行配置

时间: 2024-10-13 10:44:52

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