when i connect from the command prompt as sysdba the
ORA-12540:TNS:internal limit restriction exceeded
On metalink i found a possible reason for this problem:
The previous SQL*Plus session terminated abnormally which left a
shadow process which was not properly cleaned up. If more than 3 of
these shadow processes have been left, the next SQL*Plus session gets
an error and is not able to connect.
I want my 450 users to get connected to my database server