1. Log in to the Linux operating system as the root user.
2. Connect to the Oracle database.
# su - oracle
$ sqlplus / as sysdba
3. Check the maximum number of Oracle database connections.
> select value from v$parameter where name = 'processes';
4. Change the maximum number of Oracle database connections to 500.
> alter system set processes = 500 scope = spfile;
5. Restart the Oracle database.