SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area 6341787648 bytes
Fixed Size                  2093488 bytes
Variable Size            5402267216 bytes
Database Buffers          922746880 bytes
Redo Buffers               14680064 bytes
Database mounted.
SQL> ALTER SYSTEM SET sga_target = 4294967296 SCOPE=BOTH
2 ;

System altered.

SQL> alter database mount
2 ;
alter database mount
*
ERROR at line 1:
ORA-01100: database already mounted

SQL> alter database open;

Database altered.

SQL> show parameter db_recovery_file_dest_size;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest_size big integer 400G
SQL> select * from v$recovery_file_dest;

NAME
--------------------------------------------------------------------------------
SPACE_LIMIT SPACE_USED SPACE_RECLAIMABLE NUMBER_OF_FILES
----------- ---------- ----------------- ---------------
+ORABK
4.2950E+11 1.0887E+11 3.7276E+10 1680

oracle 10g更改sga最大值

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