ORA-27101错误的解决策

ERROR:

ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist

原因：

oracle instance is not started.

对策：

C:\>sqlplus /nolog

SQL*Plus: Release 12.1.0.2.0 Production on Tue Jun 28 11:34:53 2016

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

SQL> connect / as sysdba

Connected to an idle instance.

SQL> startup

ORACLE instance started.

Total System Global Area 2248146944 bytes

Fixed Size                  3048008 bytes

Variable Size             620760504 bytes

Database Buffers         1610612736 bytes

Redo Buffers               13725696 bytes

Database mounted.

Database opened.

结果：

connect ok!