Chinaunix首页 | 论坛 | 博客
  • 博客访问: 466319
  • 博文数量: 448
  • 博客积分: 0
  • 博客等级: 民兵
  • 技术积分: 4536
  • 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(448)

文章存档

2021年(151)

2020年(37)

2019年(222)

2018年(38)

我的朋友

分类: Oracle

2018-07-09 11:16:29

2、Which two are true about Optimizer Statistics?
? A) They do not persist across Instance restarts.
? B) They are automatically updated when DDL statements execute.
? C) They are gathered by the Manageability Monitor (MMON) background process.
? D) They can be gathered by executing the PL/SQL procedures in the DBMS_STATS package.
? E) They can be used to determine the events on which a database instance waited.
? F) They provide Information to the Optimizer so that it can determine optimal execution plans for SQL statements.

? Answer:DF
阅读(683) | 评论(0) | 转发(0) |
给主人留下些什么吧!~~