View oracle maximum number of connections with the current number of connections

• The current number of connections

SELECT * from v$process;

• The current maximum number of connections allowed by the database

1 select value from v$parameter where name = 'processes';

• Modify the maximum number of connections allowed by the current database

1 alter system set processes = 200 scope = spfile；

• Restart the database

1 shutdown immediate
2 startup