Chinaunix首页 | 论坛 | 博客
  • 博客访问: 671874
  • 博文数量: 487
  • 博客积分: 0
  • 博客等级: 民兵
  • 技术积分: 4936
  • 用 户 组: 普通用户
  • 注册时间: 2018-07-05 13:59
个人简介

ocp考试资料群:569933648 验证码:ocp OCP 12c 19c考试题库解析与资料群:钉钉群号:35277291

文章分类

全部博文(487)

文章存档

2024年(2)

2023年(37)

2021年(151)

2020年(37)

2019年(222)

2018年(38)

我的朋友

分类: Oracle

2019-07-30 13:05:30

Which two are true about Optimizer Statistics?

A)They are gathered by the Manageability Monitor(MMON) background process.

B)They can be gathered by executing the PL/SQL procedures in the DBMS_STATES package.

C)They do not persist across instance restarts.

D)They can be used to determine the events on which a database instance waited.

E)They provide information to the Optimizer so that it can determine optimal execution plans for SQL statements.

F)They are automatically updated when DDL statements execute.

Answer: BE

阅读(1053) | 评论(0) | 转发(0) |
给主人留下些什么吧!~~