ORA-12519: TNS:no appropriate service handler found
select count(*) from v$process;
select value from v$parameter where name = 'processes';
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;