How to increase number of connections in Oracle

[PAVB]

Is there any problem if i increase the value of "processes" entry in init.ora file ?

Because of your initial post we supposed you were using spfile but, if you are using pfile you have to alter init.ora.

Could you please check your initialization method by running query below?

SELECT  instance_name,
        DECODE(value, NULL, 'PFILE', 'SPFILE') "Init File Type" 
FROM    sys.v_$parameter ,
        v$instance
WHERE   name = 'spfile';