Oracle体系结构及备份(十六)bg-ckpt
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了Oracle体系结构及备份(十六)bg-ckpt,小编现在分享给大家,供广大互联网技能从业者学习和参考。文章包含3306字,纯文字阅读大概需要5分钟。
内容图文
![Oracle体系结构及备份(十六)bg-ckpt](/upload/InfoBanner/zyjiaocheng/535/3b8b98a725144024a87f31fbae5e3dec.jpg)
一什么是CKPT进程 作用: 发出信号给DBWn 更新数据文件头 更新控制文件 At specific times, all modified databasebuffers in the system global area are written to the datafiles by DBWn. Thisevent is called a checkpoint. The checkpoint process is
一 什么是CKPT进程
作用:
发出信号给DBWn
更新数据文件头
更新控制文件
At specific times, all modified databasebuffers in the system global area are written to the datafiles by DBWn. Thisevent is called a checkpoint. The checkpoint process is responsible forsignalling DBWn at checkpoints and updating all the datafiles and control filesof the database to indicate the most recent checkpoint.
二 操作示例
[oracle@localhost 桌面]$ ps -ef | grep ora_ oracle 6491 1 0 11:17 ? 00:00:00 ora_pmon_orcl oracle 6493 1 0 11:17 ? 00:00:00 ora_psp0_orcl oracle 6495 1 0 11:17 ? 00:00:00 ora_mman_orcl oracle 6497 1 0 11:17 ? 00:00:00 ora_dbw0_orcl oracle 6499 1 0 11:17 ? 00:00:00 ora_lgwr_orcl oracle 6501 1 0 11:17 ? 00:00:00 ora_ckpt_orcl oracle 6503 1 0 11:17 ? 00:00:00 ora_smon_orcl oracle 6505 1 0 11:17 ? 00:00:00 ora_reco_orcl oracle 6507 1 0 11:17 ? 00:00:00 ora_cjq0_orcl oracle 6509 1 0 11:17 ? 00:00:00 ora_mmon_orcl oracle 6511 1 0 11:17 ? 00:00:00 ora_mmnl_orcl oracle 6513 1 0 11:17 ? 00:00:00 ora_d000_orcl oracle 6515 1 0 11:17 ? 00:00:00 ora_s000_orcl oracle 6519 1 0 11:17 ? 00:00:00 ora_qmnc_orcl oracle 6527 1 0 11:18 ? 00:00:00 ora_q000_orcl oracle 6529 1 0 11:18 ? 00:00:00 ora_q001_orcl oracle 6538 1 0 11:19 ? 00:00:00 ora_j000_orcl oracle 6541 2720 0 11:19 pts/0 00:00:00 grep ora_ [oracle@localhost 桌面]$ ps -ef | grep ora_ | grep ckpt oracle 6501 1 0 11:17 ? 00:00:00 ora_ckpt_orcl [oracle@localhost 桌面]$ kill -9 6501 [oracle@localhost 桌面]$ ps -ef | grep ora_ | grep ckpt [oracle@localhost 桌面]$ ps -ef | grep ora_ oracle 6554 2720 0 11:20 pts/0 00:00:00 grep ora_ [oracle@localhost 桌面]$ sqlplus / as sysdba; SQL*Plus: Release 10.2.0.1.0 - Production on Thu Jun 6 11:20:14 2013 Copyright (c) 1982, 2005, Oracle. All rights reserved. Connected to an idle instance. SQL> startup ORACLE instance started. Total System Global Area 838860800 bytes Fixed Size 1222192 bytes Variable Size 788531664 bytes Database Buffers 46137344 bytes Redo Buffers 2969600 bytes Database mounted. Database opened. SQL> exit; Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, OLAP and Data Mining options [oracle@localhost 桌面]$ ps -ef | grep ora_ | grep ckpt oracle 6568 1 0 11:20 ? 00:00:00 ora_ckpt_orcl
三 总结
1.CKPT,非常非常重要的后台进程,同样不能kill。触发顺序:CKPT------>DBWR------->LGWR
2.作用:发出信号给DBWn、更新数据文件头、更新控制文件
3.Linux中使用ps命令查看CKPT进程。
我的邮箱:wgbno27@163.com 新浪微博:@Wentasy27 微信公众平台:JustOracle(微信号:justoracle) 数据库技术交流群:336882565(加群时验证 From CSDN XXX) Oracle交流讨论组:https://groups.google.com/d/forum/justoracle By Larry Wen
@Wentasy |
内容总结
以上是互联网集市为您收集整理的Oracle体系结构及备份(十六)bg-ckpt全部内容,希望文章能够帮你解决Oracle体系结构及备份(十六)bg-ckpt所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错,欢迎将互联网集市网站推荐给程序员好友。
内容备注
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 gblab@vip.qq.com 举报,一经查实,本站将立刻删除。
内容手机端
扫描二维码推送至手机访问。