zoukankan      html  css  js  c++  java
  • OCP 12c 062题库大更新,出现大量新题-5

    5.One of your databases supports an OLTP workload.

    The default undo tablespace is fixed size with:

    1. RETENTION NOGUARANTEE

    2. undo_retention is 12 minutes

    User scott get this error after a query on the sales table has run for more than 15 minutes:

    ORA-01555: snapshot too old

    Which three factors taken separately or in some combination might be the cause?

    A) A committed delete to the sales table was made more than 12 minutes before the query began.

    B) An uncommitted delete to the sales table was made more than 12 minutes before the query began.

    C) A committed update to the sales table was made more than 12 minutes before the query began.

    D) An uncommitted update to the sales table was made more than 12 minutes before the query began.

    E) An update was made to the sales table before the query began.

    F) An update to the SALES table was committed after the query began.

    G) An update was made to the sales table after the query began.

    Answer:ACF

    (解析:题目的意思是:哪三个因素单独或结合在一起可能是原因?快照太老是因为一个长时间运行的查询语句,所要查询的对象在 undo 段找不到而产生的,找不到的原因是事务已经提交了,原来使用的 undo 段被覆盖。3组:1015267481 验证ocp)

  • 相关阅读:
    FastAdmin Shopro商城安装
    MYSQL ERROR 10060
    宝塔命令
    kdevtmpfsi挖矿病毒处理
    VUE安装
    原生JS请求(AJAX)
    Bootstrap: 模态框组件
    Bootstrap: 缩略图组件
    Bootstrap: 栅格系统
    Bootstrap: 下拉菜单组件 & 分页组件
  • 原文地址:https://www.cnblogs.com/cnblogs5359/p/10761229.html
Copyright © 2011-2022 走看看