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$ sqlplus /nolog


SQL*Plus: Release 11.2.0.4.0 Production on Fri Apr 25 20:20:46 2014


Copyright (c) 1982, 2013, Oracle.  All rights reserved.


SQL> conn /as sysdba;

Connected.

SQL>

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup nomount;

ORACLE instance started.


Total System Global Area 3273641984 bytes

Fixed Size                  2257680 bytes

Variable Size            1879051504 bytes

Database Buffers         1375731712 bytes

Redo Buffers               16601088 bytes

SQL>

SQL> show parameter db_recovery_file_dest_size;


NAME                                 TYPE

------------------------------------ ----------------------

VALUE

------------------------------

db_recovery_file_dest_size           big integer

3882M

SQL>

SQL> alter system set db_recovery_file_dest_size=4882M scope=spfile;


System altered.


SQL> shutdown

ORA-01507: database not mounted



ORACLE instance shut down.

SQL> startup

ORACLE instance started.


Total System Global Area 3273641984 bytes

Fixed Size                  2257680 bytes

Variable Size            1879051504 bytes

Database Buffers         1375731712 bytes

Redo Buffers               16601088 bytes

Database mounted.

Database opened.

SQL> quit