zoukankan      html  css  js  c++  java
  • OCP-1Z0-053-V12.02-377题

     

    377.AUM has been retaining about 15 minutes worth of undo. You want to double the retention period, but

    not at the expense of new transactions failing. You decide to alter the system to set the parameter

    UNDO_RETENTION=18000. However, AUM still retains only about 15 minutes worth of undo. What is the

    problem? (Choose the best answer.)

    A. You need to alter the undo tablespace to add the RETENTION GUARANTEE setting.

    B. You need to increase the size of the undo tablespace.

    C. The undo tablespace is not set to auto-extend.

    D. You need to alter the Recycle Bin to add the RETENTION GUARANTEE setting.

    Answer: C

    答案解析:

    题中说希望把保留时间变为30分钟,但是不能让新的事务失败为代价。

    如果想把时间变为30分钟,有两个方法,一个是设置RETENTION GUARANTEE,确保保留时间为30分钟。

    一个是让undo表空间自动增长。

    而设置RETENTION GUARANTEE,但undo表空间是固定尺寸的情况下,会让新的事务失败。

    故最好的办法就是让undo表空间自动增长。


  • 相关阅读:
    使用Anaconda安装TensorFlow
    更新pip源/anaconda源
    PHP 中 config.m4 的探索
    有趣的智力题
    工作中MySql的了解到的小技巧
    一篇关于PHP性能的文章
    eslasticsearch操作集锦
    curl 命令详解~~
    Nginx 调优经验记录
    Elasticsearch安装使用
  • 原文地址:https://www.cnblogs.com/hzcya1995/p/13316621.html
Copyright © 2011-2022 走看看