I am unable to connect database this error  ORA-00020: maximum number of

i issuing this command / as sysdba .getting this error
Enter user-name: / as sysdba
ERROR:
ORA-00020: maximum number of processes (300) exceeded
how to resolve this problem.it is verry verry urgent.

Hi
"Maximum number of processes exceeded" will be alerted when your database has received a request for connection from a process which is beyond the number of processes your database can allow for.
Please check your database parameters
show parameters processes
Couple of options:
a) If your database has been running for a while and if it's the first time you are recieving this error, please check why all of a sudden more and more processes have been created. You may want to investigate your application, users, etc
b) If it's a valid request and if it's the case that you haven't really configured enough processes, you will have to increase the PROCESSES parameter in your init file and restart the database. It's not a dynamic parameter. Also, make sure you increase the sessions parameter as well along with the processes.
Before you do this, you will also have to check if your OS has been configured for increasing the number of processes. Think it's semmsl in Unix.

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    (SID_NAME = PLSExtProc)
    (ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
    (PROGRAM = extproc)
         (SID_DESC =
    (SID_NAME = CLRExtProc)
    (ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
    (PROGRAM = extproc)
    LISTENER =
    (DESCRIPTION_LIST =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
    (ADDRESS = (PROTOCOL = TCP)(HOST = LNZ-PEOPLESOFT)(PORT = 1521))
    content tnsnames.ora
    # tnsnames.ora Network Configuration File: C:\oracle\product\10.2.0\db_1\network\admin\tnsnames.ora
    # Generated by Oracle configuration tools.
    PS =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = LNZ-PEOPLESOFT)(PORT = 1521))
    (CONNECT_DATA =
    (SERVER = DEDICATED)
    (SERVICE_NAME = PS)
    ORCL =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = LNZ-PEOPLESOFT)(PORT = 1521))
    (CONNECT_DATA =
    (SERVER = DEDICATED)
    (SERVICE_NAME = orcl)
    EXTPROC_CONNECTION_DATA =
    (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
    (CONNECT_DATA =
    (SID = PLSExtProc)
    (PRESENTATION = RO)
    i'll give and reslult after execute lsnrctl status:
    C:\>lsnrctl status
    LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 18-JUL-2012 15:07
    :44
    Copyright (c) 1991, 2005, Oracle. All rights reserved.
    Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
    TNS-12541: TNS:no listener
    TNS-12560: TNS:protocol adapter error
    TNS-00511: No listener
    32-bit Windows Error: 2: No such file or directory
    Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=LNZ-PEOPLESOFT)(PORT=152
    1)))
    STATUS of the LISTENER
    Alias LISTENER
    Version TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Produ
    ction
    Start Date 18-JUL-2012 14:32:44
    Uptime 0 days 0 hr. 35 min. 2 sec
    Trace Level off
    Security ON: Local OS Authentication
    SNMP OFF
    Listener Log File C:\oracle\product\10.2.0\db_1\network\log\listener.log
    Listening Endpoints Summary...
    (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=LNZ-PEOPLESOFT.microfocus.com)(PORT=
    1521)))
    Services Summary...
    Service "PS_XPT" has 1 instance(s).
    Instance "ps", status READY, has 1 handler(s) for this service...
    Service "ps" has 1 instance(s).
    Instance "ps", status READY, has 1 handler(s) for this service...
    The command completed successfully
    C:\>lsnrctl service
    LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 18-JUL-2012 15:08
    :34
    Copyright (c) 1991, 2005, Oracle. All rights reserved.
    Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
    TNS-12541: TNS:no listener
    TNS-12560: TNS:protocol adapter error
    TNS-00511: No listener
    32-bit Windows Error: 2: No such file or directory
    Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=LNZ-PEOPLESOFT)(PORT=152
    1)))
    Services Summary...
    Service "PS_XPT" has 1 instance(s).
    Instance "ps", status READY, has 1 handler(s) for this service...
    Handler(s):
    "DEDICATED" established:0 refused:0 state:ready
    LOCAL SERVER
    Service "ps" has 1 instance(s).
    Instance "ps", status READY, has 1 handler(s) for this service...
    Handler(s):
    "DEDICATED" established:0 refused:0 state:ready
    LOCAL SERVER
    The command completed successfully
    I can login in sqlplus with as sysdba and with system/manager
    Thank you in advance

    I have compare listener.ora and tnsnames.ora but there using host name of the machine. On the machines Firewall is disabled
    listener.ora
    # listener.ora Network Configuration File: C:\oracle\product\10.2.0\db_1\network\admin\listener.ora
    # Generated by Oracle configuration tools.
    SID_LIST_LISTENER =
    (SID_LIST =
    (SID_DESC =
    (SID_NAME = PLSExtProc)
    (ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
    (PROGRAM = extproc)
         (SID_DESC =
    (SID_NAME = CLRExtProc)
    (ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
    (PROGRAM = extproc)
    LISTENER =
    (DESCRIPTION_LIST =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
    (ADDRESS = (PROTOCOL = TCP)(HOST = LNZ-PEOPLESOFT)(PORT = 1521))
    tnsnames.ora
    # tnsnames.ora Network Configuration File: C:\oracle\product\10.2.0\db_1\network\admin\tnsnames.ora
    # Generated by Oracle configuration tools.
    PS =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = LNZ-PEOPLESOFT)(PORT = 1521))
    (CONNECT_DATA =
    (SERVER = DEDICATED)
    (SERVICE_NAME = PS)
    ORCL =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = LNZ-PEOPLESOFT)(PORT = 1521))
    (CONNECT_DATA =
    (SERVER = DEDICATED)
    (SERVICE_NAME = orcl)
    EXTPROC_CONNECTION_DATA =
    (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
    (CONNECT_DATA =
    (SID = PLSExtProc)
    (PRESENTATION = RO)
    )

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