[mysql]Mysql,Oracle数据库连接数简析

Mysql,Oracle数据库连接数简析

Mysql

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D:\Program Files\MySQL\MySQL Server 5.1\bin>mysql -u root -p
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Enter password: ****
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Welcome to the MySQL monitor.  Commands end with ; or \g.
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Your MySQL connection id is 183  www.atcpu.com  
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Server version: 5.1.58-community MySQL Community Server (GPL)
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Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
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This software comes with ABSOLUTELY NO WARRANTY. This is free software,
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and you are welcome to modify and redistribute it under the GPL v2 license
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
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-- 使用xuexi数据库
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mysql> use xuexi
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Database changed
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-- 查看字符集
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mysql> SHOW VARIABLES LIKE 'character_set%';
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-- 控制台汉字乱码，将编码改为gbk，控制台就可以显示中文了
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mysql> set character_set_results='gbk';
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-- 查看连接数  www.atcpu.com  
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mysql> SHOW PROCESSLIST;--100条
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mysql> show full processlist;
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-- 服务器的状态信息
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mysql> show status;

Oracle

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SQL> conn / as sysdba
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Connected.
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-- 连接数
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SQL> select count(*) from v$session;
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-- 并发连接数
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SQL> Select count(*) from v$session where status='ACTIVE';
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--最大连接
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SQL> show parameter processes;
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-- 修改processes和sessions值
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SQL> alter system set processes=300 scope=spfile;
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SQL> alter system set sessions=300 scope=spfile;




作者 车水码农