select username,count(username) from v$session where username is not null group byusername
2、缺省从 v$session 中不能直接获得客户端 IP,可以在数据库中创建一个追踪客户端 IP
地址的触发器:
create or replace trigger on_logon_trigger after logon on databasebegindbms_application_info.set_client_info(sys_context('userenv', 'ip_address'));end;/
3、比较常用的显示客户端信息的sql:
select sid,serial#,username,program,machine,client_info
from v$session
where username is not null
order by username,program,machine;显示结果:
1 102 2986 AMS_TEST JDBC Thin Client MICROSO-V22G1JA 192.168.0.92
2 375 10078 AMS_TEST JDBC Thin Client MICROSO-V22G1JA 192.168.0.92
3 858 1751 AMS_TEST JDBC Thin Client MICROSO-V22G1JA 192.168.0.92
4 761 5406 AMS_TEST JDBC Thin Client MICROSO-V22G1JA 192.168.0.92
5 803 3590 AMS_TEST JDBC Thin Client MICROSO-V22G1JA 192.168.0.92
6 448 2525 AMS_TEST JDBC Thin Client MICROSO-V22G1JA 192.168.0.92
7 654 10009 HDCZOA JDBC Thin Client WWW-18843A7DA64 192.168.0.115
8 659 9547 HDCZOA JDBC Thin Client WWW-18843A7DA64 192.168.0.115
9 664 7554 HDCZOA JDBC Thin Client WWW-18843A7DA64 192.168.0.115
10 693 6960 HDCZOA JDBC Thin Client WWW-18843A7DA64 192.168.0.115
11 714 3672 HDCZOA JDBC Thin Client WWW-18843A7DA64 192.168.0.115
12 724 13457 HDCZOA JDBC Thin Client WWW-18843A7DA64 192.168.0.115
4、查看当前Oracle 的连接数
select count(*) from v$process;
5、查看数据库允许的最大连接数
select value from v$parameter where name='processes';6、修改最大连接数