用户进程Oracle体系结构及备份（三）——user-process

发一下牢骚和主题无关：

    

一 什么是用户进程

     

            用户进程是指用户到Oracle数据库服务器的链接，用户进程处置用户输入并通过Oracle程序接口与Oracle服务器进程通信。用户进程还负责表现用户请求的信息，必要时可以将信息处置成更有用的形式。用户通过客户端，比如SQL Plus、SQL Developer、PL SQL Developer、Toad等工具连接上服务器而发生的进程。

     

    

二 怎样查看用户进程

     

            通过视图v$session进行查看。示例：

     

[oracle@localhost 桌面]$ lsnrctl start



LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 27-MAY-2013 19:33:25



Copyright (c) 1991, 2005, Oracle.  All rights reserved.



Starting /oracle/oracle//product/10.2.0/db_1/bin/tnslsnr: please wait...



TNSLSNR for Linux: Version 10.2.0.1.0 - Production

System parameter file is /oracle/oracle//product/10.2.0/db_1/network/admin/listener.ora

Log messages written to /oracle/oracle//product/10.2.0/db_1/network/log/listener.log

Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1)))

Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1521)))



Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))

STATUS of the LISTENER

------------------------

Alias                     LISTENER

Version                   TNSLSNR for Linux: Version 10.2.0.1.0 - Production

Start Date                27-MAY-2013 19:33:27

Uptime                    0 days 0 hr. 0 min. 0 sec

Trace Level               off

Security                  ON: Local OS Authentication

SNMP                      OFF

Listener Parameter File   /oracle/oracle//product/10.2.0/db_1/network/admin/listener.ora

Listener Log File         /oracle/oracle//product/10.2.0/db_1/network/log/listener.log

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1)))

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1521)))

Services Summary...

Service "PLSExtProc" has 1 instance(s).

  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...

The command completed successfully

[oracle@localhost 桌面]$ sqlplus 



SQL*Plus: Release 10.2.0.1.0 - Production on Mon May 27 19:33:34 2013



Copyright (c) 1982, 2005, Oracle.  All rights reserved.



Enter user-name: / as sysdba

Connected to an idle instance.



SQL> startup

ORACLE instance started.



Total System Global Area  167772160 bytes

Fixed Size		    1218316 bytes

Variable Size		   71305460 bytes

Database Buffers	   92274688 bytes

Redo Buffers		    2973696 bytes

sDatabase mounted.

Database opened.

SQL> show parameter user_



NAME				     TYPE	 VALUE

------------------------------------ ----------- ------------------------------

license_max_users		     integer	 0

user_dump_dest			     string	 /oracle/oracle/product/10.2.0/

						 db_1/admin/orcl/udump

SQL> desc v$session;

 Name					   Null?    Type

 ----------------------------------------- -------- ----------------------------

 SADDR						    RAW(4)

 SID						    NUMBER

 SERIAL#					    NUMBER

 AUDSID 					    NUMBER

 PADDR						    RAW(4)

 USER#						    NUMBER

 USERNAME					    VARCHAR2(30)

 COMMAND					    NUMBER

 OWNERID					    NUMBER

 TADDR						    VARCHAR2(8)

 LOCKWAIT					    VARCHAR2(8)

 STATUS 					    VARCHAR2(8)

 SERVER 					    VARCHAR2(9)

 SCHEMA#					    NUMBER

 SCHEMANAME					    VARCHAR2(30)

 OSUSER 					    VARCHAR2(30)

 PROCESS					    VARCHAR2(12)

 MACHINE					    VARCHAR2(64)

 TERMINAL					    VARCHAR2(30)

 PROGRAM					    VARCHAR2(48)

 TYPE						    VARCHAR2(10)

 SQL_ADDRESS					    RAW(4)

 SQL_HASH_VALUE 				    NUMBER

 SQL_ID 					    VARCHAR2(13)

 SQL_CHILD_NUMBER				    NUMBER

 PREV_SQL_ADDR					    RAW(4)

 PREV_HASH_VALUE				    NUMBER

 PREV_SQL_ID					    VARCHAR2(13)

 PREV_CHILD_NUMBER				    NUMBER

 MODULE 					    VARCHAR2(48)

 MODULE_HASH					    NUMBER

 ACTION 					    VARCHAR2(32)

 ACTION_HASH					    NUMBER

 CLIENT_INFO					    VARCHAR2(64)

 FIXED_TABLE_SEQUENCE				    NUMBER

 ROW_WAIT_OBJ#					    NUMBER

 ROW_WAIT_FILE# 				    NUMBER

 ROW_WAIT_BLOCK#				    NUMBER

 ROW_WAIT_ROW#					    NUMBER

 LOGON_TIME					    DATE

 LAST_CALL_ET					    NUMBER

 PDML_ENABLED					    VARCHAR2(3)

 FAILOVER_TYPE					    VARCHAR2(13)

 FAILOVER_METHOD				    VARCHAR2(10)

 FAILED_OVER					    VARCHAR2(3)

 RESOURCE_CONSUMER_GROUP			    VARCHAR2(32)

 PDML_STATUS					    VARCHAR2(8)

 PDDL_STATUS					    VARCHAR2(8)

 PQ_STATUS					    VARCHAR2(8)

 CURRENT_QUEUE_DURATION 			    NUMBER

 CLIENT_IDENTIFIER				    VARCHAR2(64)

 BLOCKING_SESSION_STATUS			    VARCHAR2(11)

 BLOCKING_INSTANCE				    NUMBER

 BLOCKING_SESSION				    NUMBER

 SEQ#						    NUMBER

 EVENT# 					    NUMBER

 EVENT						    VARCHAR2(64)

 P1TEXT 					    VARCHAR2(64)

 P1						    NUMBER

 P1RAW						    RAW(4)

 P2TEXT 					    VARCHAR2(64)

 P2						    NUMBER

 P2RAW						    RAW(4)

 P3TEXT 					    VARCHAR2(64)

 P3						    NUMBER

 P3RAW						    RAW(4)

 WAIT_CLASS_ID					    NUMBER

 WAIT_CLASS#					    NUMBER

 WAIT_CLASS					    VARCHAR2(64)

 WAIT_TIME					    NUMBER

 SECONDS_IN_WAIT				    NUMBER

 STATE						    VARCHAR2(19)

 SERVICE_NAME					    VARCHAR2(64)

 SQL_TRACE					    VARCHAR2(8)

 SQL_TRACE_WAITS				    VARCHAR2(5)

 SQL_TRACE_BINDS				    VARCHAR2(5)



SQL> desc v$process;

 Name					   Null?    Type

 ----------------------------------------- -------- ----------------------------

 ADDR						    RAW(4)

 PID						    NUMBER

 SPID						    VARCHAR2(12)

 USERNAME					    VARCHAR2(15)

 SERIAL#					    NUMBER

 TERMINAL					    VARCHAR2(30)

 PROGRAM					    VARCHAR2(48)

 TRACEID					    VARCHAR2(255)

 BACKGROUND					    VARCHAR2(1)

 LATCHWAIT					    VARCHAR2(8)

 LATCHSPIN					    VARCHAR2(8)

 PGA_USED_MEM					    NUMBER

 PGA_ALLOC_MEM					    NUMBER

 PGA_FREEABLE_MEM				    NUMBER

 PGA_MAX_MEM					    NUMBER



SQL> desc v$sql;

 Name					   Null?    Type

 ----------------------------------------- -------- ----------------------------

 SQL_TEXT					    VARCHAR2(1000)

 SQL_FULLTEXT					    CLOB

 SQL_ID 					    VARCHAR2(13)

 SHARABLE_MEM					    NUMBER

 PERSISTENT_MEM 				    NUMBER

 RUNTIME_MEM					    NUMBER

 SORTS						    NUMBER

 LOADED_VERSIONS				    NUMBER

 OPEN_VERSIONS					    NUMBER

 USERS_OPENING					    NUMBER

 FETCHES					    NUMBER

 EXECUTIONS					    NUMBER

 PX_SERVERS_EXECUTIONS				    NUMBER

 END_OF_FETCH_COUNT				    NUMBER

 USERS_EXECUTING				    NUMBER

 LOADS						    NUMBER

 FIRST_LOAD_TIME				    VARCHAR2(38)

 INVALIDATIONS					    NUMBER

 PARSE_CALLS					    NUMBER

 DISK_READS					    NUMBER

 DIRECT_WRITES					    NUMBER

 BUFFER_GETS					    NUMBER

 APPLICATION_WAIT_TIME				    NUMBER

 CONCURRENCY_WAIT_TIME				    NUMBER

 CLUSTER_WAIT_TIME				    NUMBER

 USER_IO_WAIT_TIME				    NUMBER

 PLSQL_EXEC_TIME				    NUMBER

 JAVA_EXEC_TIME 				    NUMBER

 ROWS_PROCESSED 				    NUMBER

 COMMAND_TYPE					    NUMBER

 OPTIMIZER_MODE 				    VARCHAR2(10)

 OPTIMIZER_COST 				    NUMBER

 OPTIMIZER_ENV					    RAW(797)

 OPTIMIZER_ENV_HASH_VALUE			    NUMBER

 PARSING_USER_ID				    NUMBER

 PARSING_SCHEMA_ID				    NUMBER

 PARSING_SCHEMA_NAME				    VARCHAR2(30)

 KEPT_VERSIONS					    NUMBER

 ADDRESS					    RAW(4)

 TYPE_CHK_HEAP					    RAW(4)

 HASH_VALUE					    NUMBER

 OLD_HASH_VALUE 				    NUMBER

 PLAN_HASH_VALUE				    NUMBER

 CHILD_NUMBER					    NUMBER

 SERVICE					    VARCHAR2(64)

 SERVICE_HASH					    NUMBER

 MODULE 					    VARCHAR2(64)

 MODULE_HASH					    NUMBER

 ACTION 					    VARCHAR2(64)

 ACTION_HASH					    NUMBER

 SERIALIZABLE_ABORTS				    NUMBER

 OUTLINE_CATEGORY				    VARCHAR2(64)

 CPU_TIME					    NUMBER

 ELAPSED_TIME					    NUMBER

 OUTLINE_SID					    NUMBER

 CHILD_ADDRESS					    RAW(4)

 SQLTYPE					    NUMBER

 REMOTE 					    VARCHAR2(1)

 OBJECT_STATUS					    VARCHAR2(19)

 LITERAL_HASH_VALUE				    NUMBER

 LAST_LOAD_TIME 				    VARCHAR2(38)

 IS_OBSOLETE					    VARCHAR2(1)

 CHILD_LATCH					    NUMBER

 SQL_PROFILE					    VARCHAR2(64)

 PROGRAM_ID					    NUMBER

 PROGRAM_LINE#					    NUMBER

 EXACT_MATCHING_SIGNATURE			    NUMBER

 FORCE_MATCHING_SIGNATURE			    NUMBER

 LAST_ACTIVE_TIME				    DATE

 BIND_DATA					    RAW(2000)



SQL> desc v$sqltext;

 Name					   Null?    Type

 ----------------------------------------- -------- ----------------------------

 ADDRESS					    RAW(4)

 HASH_VALUE					    NUMBER

 SQL_ID 					    VARCHAR2(13)

 COMMAND_TYPE					    NUMBER

 PIECE						    NUMBER

 SQL_TEXT					    VARCHAR2(64)



--sys用户登录，用session查看用户进程

SQL> SELECT username,sid FROM v$session;



USERNAME			      SID

------------------------------ ----------

				      149

				      150

				      152

				      155

SYS				      159

				      160

				      161

				      162

				      163

				      164

				      165



USERNAME			      SID

------------------------------ ----------

				      166

				      167

				      168

				      169

				      170



16 rows selected.



--再以自建用户wgb登录，再次查看，会发现新增一条记载

SQL> SELECT username, sid from V$SESSION;



USERNAME			      SID

------------------------------ ----------

WGB				      147

				      149

				      150

				      152

				      155

SYS				      159

				      160

				      161

				      162

				      163

				      164



USERNAME			      SID

------------------------------ ----------

				      165

				      166

				      167

				      168

				      169

				      170



17 rows selected.

    每日一道理
人的生命似洪水奔流，不遇着岛屿和暗礁，难以激起美丽的浪花。

    
 

    

三 说明

     

            SID：用户进程与服务器端进程进行连接发生的

            没有用户名的记载：本身存在的一些连接，比如后台进程

            PID：v$process视图进程查询

     

    

四 用户进程对DBA管理的作用

     

            如何去控制用户与服务器进行连接的

            要不要Oracle的网络客户端

            用户进程与服务器进程发生后，是哪个用户发生的

            用户进程发生落后行了一些什么工作

     

     

    

	@Wentasy 博文仅供参考，欢送大家来访。若有错误之处，希望批评指正。原创博文如需转载请注明出处，感谢 :) [CSDN博客]

文章结束给大家分享下程序员的一些笑话语录： 问答
Q：你是怎么区分一个内向的程序员和一个外向的程序员的？ A：外向的程序员会看着你的鞋和你说话时。
Q：为什么程序员不能区分万圣节和圣诞节？ A：这是因为 Oct 31 == Dec 25！（八进制的 31==十进制的 25）

--------------------------------- 原创文章 By
用户和进程
---------------------------------