查看並設置oracle並發連接數

1.
Sql代碼
1.select count(*) from v$process  
select count(*) from v$process --當前的數據庫連接數
2.
Sql代碼
1.select value from v$parameter where name = 'processes'
select value from v$parameter where name = 'processes'--數據庫允許的最大連接數
3.
Sql代碼
1.alter system set processes = 300 scope = spfile;
alter system set processes = 300 scope = spfile;--修改最大連接數:
4.
Sql代碼
1.shutdown immediate;  
2.startup;
shutdown immediate;
startup;--重啟數據庫
5.
Sql代碼
1.SELECT osuser, a.username,cpu_time/executions/1000000||'s', b.sql_text,machine   
2.from v$session a, v$sqlarea b  
3.where a.sql_address =b.address order by cpu_time/executions desc;
SELECT osuser, a.username,cpu_time/executions/1000000||'s', b.sql_text,machine
from v$session a, v$sqlarea b
where a.sql_address =b.address order by cpu_time/executions desc;
--查看當前有哪些用戶正在使用數據
6.
Sql代碼
1.select count(*) from v$session  
select count(*) from v$session   --當前的session連接數
7.
Sql代碼
1.select count(*) from v$session where status='ACTIVE'
select count(*) from v$session where status='ACTIVE'　--並發連接數
8.
Sql代碼
1.show parameter processes  
show parameter processes   --最大連接
9.
Sql代碼
1.alter system set processes = value scope = spfile;