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ORA-27101: shared memory realm does not exist

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ORA-27101: shared memory realm does not exist

Cause: Unable to locate shared memory realm

Action: Verify that the realm is accessible

There may be 2 scenarios, which may lead you to encounter ORA-27101

1) Invalid ORACLE_HOME and ORACLE_SID

2) Database is down

[oracle@192 ~]$ sqlplus scott/tiger

SQL*Plus: Release 10.2.0.1.0 - Production on Wed May 22 16:48:05 2013

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

ERROR:

ORA-01034: ORACLE not available

ORA-27101: shared memory realm does not exist

Linux Error: 2: No such file or directory

Scenario 1: Invalid ORACLE_HOME and ORACLE_SID:

ORA-27101 is usually due to the invalid ORACLE_HOME and ORACLE_SID parameters at OS level. You should investigate that ORACLE_HOME and ORACLE_SID are set correctly, and ORACLE_HOME should be without trailing slash.

[oracle@192 ~]$ echo $ORACLE_HOME

/data/app/oracle/product/10.2.0/db_1

[oracle@192 ~]$ echo $ORACLE_SID

testdb

In our case ORACLE_SID was not correct, we need to export ORACLE_SID to the valid one which is ora19c

[oracle@192 ~]$ export ORACLE_SID=ora10g

[oracle@192 ~]$ sqlplus scott/tiger

SQL*Plus: Release 10.2.0.1.0 - Production on Wed May 22 16:52:11 2013

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

Connected to:

Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production

With the Partitioning, OLAP and Data Mining options

Scenario 2: Database is down:

You may also face it when the database is down, to solve ORA-27101 you may have to start the database only

[oracle@192 ~]$ sqlplus sys/sys as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on Wed May 22 17:07:38 2013

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

Connected to an idle instance.

SQL> startup

ORACLE instance started.

Total System Global Area 1224736768 bytes

Fixed Size                  1219112 bytes

Variable Size             167773656 bytes

Database Buffers         1040187392 bytes

Redo Buffers               15556608 bytes

Database mounted.

Database opened.
OracleDba•

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