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  • 进程体系结构

    一：进程简介


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    • 应用程序或者Oracle数据库实用程序

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    • Oracle数据库代码

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    1：多进程Oracle 数据库代码

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    2：进程类型

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    实例恢复：SMON

    清理进程：PMON

    重做缓冲区写入磁盘：dbwn



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    ---查看数据库状态
SYS@orcl> select status from v$instance;

STATUS
------------
OPEN


---从上得知：此时数据库是打开open状态：查看此时数据库的后台进程信息

SYS@orcl> ho  ps -ef |grep ora_
oracle   11999     1  0 May09 ?        00:00:05 ora_pmon_orcl
oracle   12001     1  0 May09 ?        00:00:18 ora_psp0_orcl
oracle   12003     1  0 May09 ?        00:00:29 ora_vktm_orcl
oracle   12007     1  0 May09 ?        00:00:01 ora_gen0_orcl
oracle   12009     1  0 May09 ?        00:00:01 ora_diag_orcl
oracle   12011     1  0 May09 ?        00:00:02 ora_dbrm_orcl
oracle   12013     1  0 May09 ?        00:00:10 ora_dia0_orcl
oracle   12015     1  0 May09 ?        00:00:01 ora_mman_orcl
oracle   12017     1  0 May09 ?        00:00:19 ora_dbw0_orcl
oracle   12019     1  0 May09 ?        00:00:28 ora_lgwr_orcl
oracle   12021     1  0 May09 ?        00:00:26 ora_ckpt_orcl
oracle   12023     1  0 May09 ?        00:01:10 ora_smon_orcl
oracle   12025     1  0 May09 ?        00:00:01 ora_reco_orcl
oracle   12027     1  0 May09 ?        00:00:20 ora_mmon_orcl
oracle   12029     1  0 May09 ?        00:01:48 ora_mmnl_orcl
oracle   12031     1  0 May09 ?        00:00:01 ora_d000_orcl
oracle   12033     1  0 May09 ?        00:00:02 ora_s000_orcl
oracle   12062     1  0 May09 ?        00:00:09 ora_arc0_orcl
oracle   12064     1  0 May09 ?        00:00:10 ora_arc1_orcl
oracle   12066     1  0 May09 ?        00:00:01 ora_arc2_orcl
oracle   12070     1  0 May09 ?        00:00:14 ora_arc3_orcl
oracle   12072     1  0 May09 ?        00:00:01 ora_qmnc_orcl
oracle   12088     1  0 May09 ?        00:00:17 ora_cjq0_orcl
oracle   12092     1  0 May09 ?        00:00:01 ora_q000_orcl
oracle   12126     1  0 May09 ?        00:00:01 ora_smco_orcl
oracle   25238     1  0 15:56 ?        00:00:00 ora_q002_orcl
oracle   28073     1  0 22:00 ?        00:00:00 ora_vkrm_orcl
oracle   28839     1  0 23:41 ?        00:00:00 ora_w000_orcl
oracle   28853 28836  0 23:42 pts/2    00:00:00 /bin/bash -c ps -ef |grep ora_
oracle   28855 28853  0 23:42 pts/2    00:00:00 grep ora_

SYS@orcl>



    ---删除后台进程 smon ；
SYS@orcl> ho kill -9 12023
/bin/bash: line 0: kill: (12023) - No such process
---再来查看数据库状态
SYS@orcl> select status from v$instance;
select status from v$instance
*
ERROR at line 1:
ORA-03135: connection lost contact
Process ID: 28837
Session ID: 200 Serial number: 4305
---从查询结果来看：数据库的o'r'c'l实例已经不存在了，所以其数据库状态 也就不存在；

SYS@orcl>
    ---此时：oracle的所有后台进程全部终止
SYS@orcl> ho  ps -ef |grep ora_
oracle   28885 28836  0 23:48 pts/2    00:00:00 /bin/bash -c ps -ef |grep ora_
oracle   28887 28885  0 23:48 pts/2    00:00:00 grep ora_

SYS@orcl>
    SYS@orcl> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@localhost ~]$ rlwrap sqlplus / as sysdba;

SQL*Plus: Release 11.2.0.3.0 Production on Mon May 14 23:49:37 2018

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to an idle instance.
---退出再登陆后；发现此时是空闲实例
SYS@orcl>
    ----当数据库实例不能运行或者阻塞状态时，可以直接 kill -9  smon后台进程；然后再重新启动数据库：
SYS@orcl> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@localhost ~]$ rlwrap sqlplus / as sysdba;

SQL*Plus: Release 11.2.0.3.0 Production on Mon May 14 23:49:37 2018

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to an idle instance.

SYS@orcl>  startup
ORACLE instance started.

Total System Global Area  523108352 bytes
Fixed Size                  1346052 bytes
Variable Size             394266108 bytes
Database Buffers          121634816 bytes
Redo Buffers                5861376 bytes
Database mounted.
Database opened.
SYS@orcl> ho  ps -ef |grep ora_
oracle   28970     1  0 23:53 ?        00:00:00 ora_pmon_orcl
oracle   28972     1  0 23:53 ?        00:00:00 ora_psp0_orcl
oracle   28974     1  0 23:53 ?        00:00:00 ora_vktm_orcl
oracle   28978     1  0 23:53 ?        00:00:00 ora_gen0_orcl
oracle   28980     1  0 23:53 ?        00:00:00 ora_diag_orcl
oracle   28982     1  0 23:53 ?        00:00:00 ora_dbrm_orcl
oracle   28984     1  0 23:53 ?        00:00:00 ora_dia0_orcl
oracle   28986     1  3 23:53 ?        00:00:00 ora_mman_orcl
oracle   28988     1  0 23:53 ?        00:00:00 ora_dbw0_orcl
oracle   28990     1  0 23:53 ?        00:00:00 ora_lgwr_orcl
oracle   28992     1  0 23:53 ?        00:00:00 ora_ckpt_orcl
oracle   28994     1  0 23:53 ?        00:00:00 ora_smon_orcl
oracle   28996     1  0 23:53 ?        00:00:00 ora_reco_orcl
oracle   28998     1  2 23:53 ?        00:00:00 ora_mmon_orcl
oracle   29000     1  0 23:53 ?        00:00:00 ora_mmnl_orcl
oracle   29002     1  0 23:53 ?        00:00:00 ora_d000_orcl
oracle   29004     1  0 23:53 ?        00:00:00 ora_s000_orcl
oracle   29033     1  0 23:53 ?        00:00:00 ora_p000_orcl
oracle   29035     1  0 23:53 ?        00:00:00 ora_p001_orcl
oracle   29037     1  0 23:53 ?        00:00:00 ora_p002_orcl
oracle   29039     1  0 23:53 ?        00:00:00 ora_arc0_orcl
oracle   29041     1  9 23:53 ?        00:00:00 ora_arc1_orcl
oracle   29043     1 12 23:53 ?        00:00:01 ora_arc2_orcl
oracle   29045     1  9 23:53 ?        00:00:00 ora_arc3_orcl
oracle   29051     1  0 23:53 ?        00:00:00 ora_qmnc_orcl
oracle   29067     1  2 23:53 ?        00:00:00 ora_cjq0_orcl
oracle   29069     1  0 23:54 ?        00:00:00 ora_vkrm_orcl
oracle   29071     1 16 23:54 ?        00:00:00 ora_j000_orcl
oracle   29073     1  3 23:54 ?        00:00:00 ora_j001_orcl
oracle   29075     1  4 23:54 ?        00:00:00 ora_j002_orcl
oracle   29077     1  0 23:54 ?        00:00:00 ora_j003_orcl
oracle   29078 28891  0 23:54 pts/2    00:00:00 /bin/bash -c ps -ef |grep ora_
oracle   29080 29078  0 23:54 pts/2    00:00:00 grep ora_

SYS@orcl>




    二：客户端 进程描述

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    1：客户端和服务器进程

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       oracle 进程必须是在 oracle服务器上产生

    2：连接和会话

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    三：服务器进程概述

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    1：专用服务器进程

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    2：共享服务器进程

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    四：后台进程概述

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    查看后台进程 

    SYS@orcl> set linesize 3000;
SYS@orcl> select pname from v$process where pname is not null order by pname;

PNAME
-----
ARC0
ARC1
ARC2
ARC3
CJQ0
CKPT
D000
DBRM
DBW0
DIA0
DIAG

PNAME
-----
GEN0
J000
J001
LGWR
MMAN
MMNL
MMON
PMON
PSP0
Q000
Q001

PNAME
-----
QMNC
RECO
S000
SMCO
SMON
VKTM
W000

29 rows selected.

SYS@orcl>


    SYS@orcl> ho  ps -ef |grep ora_
oracle    3497     1  0 09:49 ?        00:00:00 ora_w000_orcl
oracle    3635     1  0 10:00 ?        00:00:00 ora_j000_orcl
oracle    3637     1  0 10:00 ?        00:00:00 ora_j001_orcl
oracle    3638 28891  0 10:01 pts/2    00:00:00 /bin/bash -c ps -ef |grep ora_
oracle    3640  3638  0 10:01 pts/2    00:00:00 grep ora_
oracle   28970     1  0 May14 ?        00:00:00 ora_pmon_orcl
oracle   28972     1  0 May14 ?        00:00:01 ora_psp0_orcl
oracle   28974     1  0 May14 ?        00:00:01 ora_vktm_orcl
oracle   28978     1  0 May14 ?        00:00:00 ora_gen0_orcl
oracle   28980     1  0 May14 ?        00:00:00 ora_diag_orcl
oracle   28982     1  0 May14 ?        00:00:00 ora_dbrm_orcl
oracle   28984     1  0 May14 ?        00:00:00 ora_dia0_orcl
oracle   28986     1  0 May14 ?        00:00:00 ora_mman_orcl
oracle   28988     1  0 May14 ?        00:00:01 ora_dbw0_orcl
oracle   28990     1  0 May14 ?        00:00:01 ora_lgwr_orcl
oracle   28992     1  0 May14 ?        00:00:02 ora_ckpt_orcl
oracle   28994     1  0 May14 ?        00:00:00 ora_smon_orcl
oracle   28996     1  0 May14 ?        00:00:00 ora_reco_orcl
oracle   28998     1  0 May14 ?        00:00:01 ora_mmon_orcl
oracle   29000     1  0 May14 ?        00:00:03 ora_mmnl_orcl
oracle   29002     1  0 May14 ?        00:00:00 ora_d000_orcl
oracle   29004     1  0 May14 ?        00:00:00 ora_s000_orcl
oracle   29039     1  0 May14 ?        00:00:00 ora_arc0_orcl
oracle   29041     1  9 May14 ?        00:55:49 ora_arc1_orcl
oracle   29043     1  9 May14 ?        00:55:37 ora_arc2_orcl
oracle   29045     1  9 May14 ?        00:55:33 ora_arc3_orcl
oracle   29051     1  0 May14 ?        00:00:00 ora_qmnc_orcl
oracle   29067     1  0 May14 ?        00:00:00 ora_cjq0_orcl
oracle   29082     1  0 May14 ?        00:00:00 ora_q000_orcl
oracle   29084     1  0 May14 ?        00:00:00 ora_q001_orcl
oracle   29130     1  0 May14 ?        00:00:00 ora_smco_orcl

SYS@orcl>



    1：强制性后台进程

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                   进程监视器进程 PMON

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    即：如果 PMOM进程出现问题，则数据库的网络连接可能链接不了


                   系统监视器进程 SMON

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    表空间：居多使用的都是本地管理方式


                   数据库写入器进程DBwn

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    DBWn: n 表示 数字：从0 开始  1，2，3，4，5……….


    增量检查点



                   日志写入器进程 LGWR

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    commit ；命令执行的操作：此时只是把缓冲区的数据写入到练级重做日志文件。此时数据还未写入到数据文件。

    3秒钟 开始执行

    先执行 LGWR 然后再执行 DBwn 。即：当缓冲区的脏数据写入到练级重做日志文件后，才开始将数据缓冲区的数据写入到数据库文件中。


                   LGWR与提交

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    当 ckpt开始工作的时候， 调用 DBWn开始工作，把缓冲区的数据写入到数据文件中，并从日志文件中获取SCN号来更新控制文件和数据文件头部的SCN号。

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                    恢复器进程 RECO

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    2：可选后台进程

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                    归档器进程ARCn

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                   作业队列进程 CJQ0 Jnnn


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                   闪回数据存档器进程  FBDA

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    3：从属进程


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  • 原文地址：https://www.cnblogs.com/ios9/p/9038503.html
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