SQL*Plus: Release 10.1.0.2.0 - Production on Sat Jun 25 16:47:21 2011

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Connected to an idle instance.

SQL> shutdown immediate;
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
SQL> shutdown immediate;
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
SQL>