zoukankan      html  css  js  c++  java
  • backgroup process

     

    DBWn writes when

    1.      Checkpoint

    2.      Dirty buffers threshold reached

    3.      No free buffers

    4.      Timeout

    5.      RAC ping request

    6.      Tablespace offline

    7.      Tablespace read only

    8.      Table DROP or TRUNCATE

    9.      Tablespace BEGIN BACKUP

    GLWR writes when

    1.      At commit

    2.      When one-third full

    3.      When there is 1MB of redo

    4.      Every 3 seconds

    5.      Before DBWn writes

    SMON Responsibilites

    1.      instance recovery:A.Rolls forward changes in the redo logs;B.Opens the database or user access;C.Rolls back uncommitted transactions

    2.      Coalesces free space ever 3 sec

    3.      Deallocates temporary segments

    PMON

    Cleans up after failed processes by

    A.     Rolling back the transaction

    B.     Releasing locks

    C.     Releasing other resources

    D.     Restarts dead dispatchers

    CKPT

    1.      signalling DBWn at checkpoints

    2.      Updating datafile headers and control files with checkpoint information

  • 相关阅读:
    AVFrame 解析
    Mat与图像的基本概念
    linux基本操作
    Makefile 使用
    MySQL的安装与配置——详细过程
    k8s imagePullPolicy拉取策略
    K8S拉取Django项目创建pod
    Harbor单点仓库部署
    Django项目构建发布Harbor仓库
    K8S集群部署-二进制部署
  • 原文地址:https://www.cnblogs.com/jimeper/p/1261250.html
Copyright © 2011-2022 走看看