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;
SQL> show parameter sessions;
2. 修改processes和sessions参数
SQL> alter system set processes=300 scope=spfile;
SQL> alter system set sessions=300 scope=spfile;
3. 查询当前processes和sessions连接数
SQL> select count(*) from v$process;
SQL> select count(*) from v$session;
4. 查询当前processes和sessions并发连接数
SQL> select count(*) from v$session where status='ACTIVE';
5. 查看连接数消耗情况
select b.MACHINE, b.PROGRAM, b.USERNAME, count(*) from v$process a, v$session b
where a.ADDR = b.PADDR and b.USERNAME is not null
group by b.MACHINE, b.PROGRAM, b.USERNAME
order by count(*) desc