selectcount(*) from v$process --当前的连接数 select value from v$parameter where name =‘processes‘--数据库允许的最大连接数 修改最大连接数: alter system set processes =300 scope = spfile;
重启数据库: shutdown immediate; startup;
--查看当前有哪些用户正在使用数据 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 orderby cpu_time/executions desc;
