[转贴]如何查看SQL SERVER数据库当前连接数

如何查看SQLSERVER数据库当前连接数

如何查看SQL SERVER数据库当前连接数
1.通过管理工具
开始->管理工具->性能（或者是运行里面输入mmc）然后通过添加计数器添加 SQL 的常用统计然后在下面列出的项目里面选择用户连接就可以时时查询到数据库的连接数了。不过此方法的话需要有访问那台计算机的权限，就是要通过Windows账户登陆进去才可以添加此计数器。

2.通过系统表查询

SQL code

SELECT * FROM
[Master].[dbo].[SYSPROCESSES] WHERE [DBID] IN ( SELECT
   [DBID]
FROM
  [Master].[dbo].[SYSDATABASES]
WHERE
   NAME='DBName'
)

DBName 是需要查看的数据库，然后查询出来的行数，就是当前的连接数。不过里面还有一些别的状态可以做参考用。

例如：连到master这个数据库写如下语句

SQL code

select * from sysprocesses where dbid in (select dbid fromsysdatabases where name='MyDatabase')

将所有连接MyDatabase这个数据库的连接记录都求出来。
sysprocesses这个表记录所以连接到SQL SERVER数据库的连接。

3.通过系统的存储过程来查找

SQL code

SP_WHO 'UserName'

UserName是当然登陆Sql的用户名，一般程序里面都会使用一个UserName来登陆SQL这样通过这个用户名就能查看到此用户名登陆之后占用的连接了。
如果不写UserName，那么返回的就是所有的连接。

SQL code

SP_WHO 'sa'
spid  ecid  status                        loginame                                                                                                                        hostname                                                                                                                        blk  dbname                                                                                                                          cmd             
------ ------ ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1     0     background                    sa                                                                                                                                                                                                                                                               0    NULL                                                                                                                            LAZYWRITER    
2     0     background                    sa                                                                                                                                                                                                                                                               0    master                                                                                                                          SIGNAL HANDLER 
3     0     sleeping                      sa                                                                                                                                                                                                                                                               0    NULL                                                                                                                            LOGWRITER     
4     0     background                    sa                                                                                                                                                                                                                                                               0    NULL                                                                                                                            LOCKMONITOR   
5     0     background                    sa                                                                                                                                                                                                                                                               0    master                                                                                                                          TASKMANAGER   
6     0     background                    sa                                                                                                                                                                                                                                                               0    master                                                                                                                          TASKMANAGER   
7     0     sleeping                      sa                                                                                                                                                                                                                                                               0    NULL                                                                                                                            CHECKPOINT SLEEP
8     0     background                    sa                                                                                                                                                                                                                                                               0    master                                                                                                                          TASKMANAGER   
9     0     background                    sa                                                                                                                                                                                                                                                               0    master                                                                                                                          TASKMANAGER   
10    0     background                    sa                                                                                                                                                                                                                                                               0    master                                                                                                                          TASKMANAGER   
11    0     background                    sa                                                                                                                                                                                                                                                               0    master                                                                                                                          TASKMANAGER   
12    0     background                    sa                                                                                                                                                                                                                                                               0    master                                                                                                                          TASKMANAGER   
13    0     background                    sa                                                                                                                                                                                                                                                               0    master                                                                                                                          TASKMANAGER   
51    0     runnable                      sa                                                                                                                              CHINA-668C6A66D                                                                                                                 0    master                                                                                                                          SELECT         
52    0     sleeping                      sa                                                                                                                              CHINA-668C6A66D                                                                                                                 0    master                                                                                                                          AWAITING COMMAND

（所影响的行数为 15 行）