//查看那些表被锁
select * from v$session t1, v$locked_object t2 where t1.sid = t2.SESSION_ID;
//给表解锁
alter system kill session '127,3514';(值应该根据实际的做相应的修改)
//查看当前数据库连接数
select count(*) from v$process;
//查看数据库最大连接数
select value from v$parameter where name = 'processes';
//修改数据最大连接数(要重启数据库)
alter system set processes = 500 scope = spfile;
//查看当前连接的用户
SELECT osuser, a.username,cpu_time/executions/1000000||'s', sql_fulltext,machine
from v$session a, v$sqlarea b
where a.sql_address =b.address order by cpu_time/executions desc;