ORA-0134: ORACLE not availabe
ORA-27101: shared memory realm does not exist
Estos errores suelen darse juntos cuando el Listener de Oracle está levantado, pero la BBDD Oracle no.
Lo único que tenemos que hacer es arrancar el Oracle.
¿Cómo?
Con el usuario
su - oracle
ejecutamos
bash-3.00$ sqlplus "sys as sysdba"
SQL*Plus: Release 11.2.0.3.0 Production on Wed Jun 6 09:58:47 2012
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Enter password:
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 689217536 bytes
Fixed Size 2162384 bytes
Variable Size 629145904 bytes
Database Buffers 50331648 bytes
Redo Buffers 7577600 bytes
Database mounted.
Database opened.
SQL> exit
Disconnected from Oracle Database 11g Release 11.2.0.3.0 - 64bit Production
bash-3.00$
SQL*Plus: Release 11.2.0.3.0 Production on Wed Jun 6 09:58:47 2012
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Enter password:
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 689217536 bytes
Fixed Size 2162384 bytes
Variable Size 629145904 bytes
Database Buffers 50331648 bytes
Redo Buffers 7577600 bytes
Database mounted.
Database opened.
SQL> exit
Disconnected from Oracle Database 11g Release 11.2.0.3.0 - 64bit Production
bash-3.00$
Podéis encontrar más info aquí.