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Need help:: ORA-27101: shared memory realm does not exist

977256Dec 23 2012 — edited Dec 24 2012
Hi

I have installed oracle 10g XE. but whenever I am trying to connect any schema it showing me the below error...please help.

I have tried to find out on net and got to know that it may be due to ORACLE_HOME and ORACLE_SID . can anybody please help how to resolve this issue step by step...
SQL*Plus: Release 10.2.0.1.0 - Production on Mon Dec 24 09:10:20 2012

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

SQL> conn hr/password
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist

SQL>
my tnsnames.ora :
XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = Aryan-PC)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
    )
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
    )
  )

ORACLR_CONNECTION_DATA = 
  (DESCRIPTION = 
    (ADDRESS_LIST = 
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE)) 
    ) 
    (CONNECT_DATA = 
      (SID = CLRExtProc) 
      (PRESENTATION = RO) 
    ) 
  ) 
my sqlnet.ora
# This file is actually generated by netca. But if customers choose to 
# install "Software Only", this file wont exist and without the native 
# authentication, they will not be able to connect to the database on NT.

SQLNET.AUTHENTICATION_SERVICES = (NTS)
my listner.ora
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
      (ADDRESS = (PROTOCOL = TCP)(HOST = Aryan-PC)(PORT = 1521))
    )
  )

DEFAULT_SERVICE_LISTENER = (XE)
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Locked on Jan 21 2013
Added on Dec 23 2012
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