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Oracle查看并修改最大连接数

Jun 07, 2016 pm 04:43 PM
oracle

Oracle查看并修改最大连接数 第一步,在cmd命令行,输入sqlplus 第二步,根据提示输入用户名与密码 1. 查看processes和sessio

Oracle查看并修改最大连接数

第一步,在cmd命令行,,输入sqlplus

第二步,根据提示输入用户名与密码

  1. 查看processes和sessions参数

  SQL> show parameter processes

  NAME                                TYPE        VALUE

  db_writer_processes                integer    1

  gcs_server_processes                integer    0

  job_queue_processes                integer    10

  log_archive_max_processes          integer    2

  processes                          integer    50

  SQL> show parameter sessions

  NAME                                TYPE        VALUE

  license_max_sessions                integer    0

  license_sessions_warning            integer    0

  logmnr_max_persistent_sessions      integer    1

  sessions                            integer    60

  shared_server_sessions              integer

  2. 修改processes和sessions值

  SQL> alter system set processes=300 scope=spfile;

  系统已更改。

  SQL> alter system set sessions=335 scope=spfile;

  系统已更改。

  3. 修改processes和sessions值必须重启oracle服务器才能生效

  ORACLE的连接数(sessions)与其参数文件中的进程数(process)有关,它们的关系如下:

  sessions=(1.1*process+5)

  摘(二)

  查询数据库当前进程的连接数:

  select count(*) from v$process;

  查看数据库当前会话的连接数:

  elect count(*) from v$session;

  查看数据库的并发连接数:

  select count(*) from v$session where status='ACTIVE';

  查看当前数据库建立的会话情况:

  select sid,serial#,username,program,machine,status from v$session;

 查询数据库允许的最大连接数:

  select value from v$parameter where name = 'processes';

  或者:show parameter processes;

  修改数据库允许的最大连接数:

  alter system set processes = 300 scope = spfile;

  (需要重启数据库才能实现连接数的修改)

  重启数据库:

  shutdown immediate;

  startup;

  查看当前有哪些用户正在使用数据:

  select oSUSEr,a.username,cpu_time/executions/1000000||'s',sql_fulltext,machine

  from v$session a,v$sqlarea b

  where a.sql_address = b.address

  order by cpu_time/executions desc;

  备注:UNIX 1个用户session对应一个操作系统process,而Windows体现在线程。

  启动oracle

  su - oracle

  sqlplus system/pwd as sysdba  //进入sql

  startup                                    //启动数据库

  lsnrctl start                              //启动监听

  sqlplus "/as sysdba"

  shutdown immediate;

  startup mount;

  alter database open;

Linux-6-64下安装Oracle 12C笔记

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Oracle 11gR2 在VMWare虚拟机中安装步骤

Debian 下 安装 Oracle 11g XE R2

本文永久更新链接地址:

linux

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