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 博文仅供参考，欢迎大家来访。如有错误之处，希望批评指正。原创博文如需转载请注明出处，谢谢 :) [CSDN博客] |