zoukankan      html  css  js  c++  java
  • 052-1

    View the Exhibit and examine the attributes of an undo tablespace.
    In an OLTP system, the user SCOTT has started a query on a large table in the peak transactional hour that performs bulk inserts. The query runs for more than 15 minutes and then SCOTT receives the following error:
    ORA-01555: snapshot too old
    What could be the reason for this error?
    A.The query is unable to get a read-consistent image.
    B.There is not enough space in Flash Recovery Area.
    C.There is not enough free space in the flashback archive.
    D.The query is unable to place data blocks in undo tablespace

    这个错误原因应该是高峰时期数据脏块产生,然后undo空间不够要清除延时的缓存,无法读到查询发起时的数据
    关于一致性读 http://blog.itpub.net/26736162/viewspace-2080746/






  • 相关阅读:
    Misc1
    PXE
    VCL
    pacman usage
    .vimrc的配置
    Windows Server 2012 R2
    Windows 入门杂乱无章版
    VS Code Plugins And Configuration
    「Poetize5」GF弹钢琴
    「Poetize4」上帝造题的七分钟2
  • 原文地址:https://www.cnblogs.com/Babylon/p/7930334.html
Copyright © 2011-2022 走看看