Oracle 11g sga_target parameter settings

The developer asked me to set an Oracle 11g sga slightly larger. Therefore, follow the previous 10 Gb memory operation on oracle.
[Oracle @ localhost db_1] $ sqlplus/nolog
 
SQL * Plus: Release 11.2.0.1.0 Production on Saturday June 30 13:42:07 2012
 
Copyright (c) 1982,200 9, Oracle. All rights reserved.
 
SQL> conn/as sysdba
Connected.
SQL> show parameter sga;
 
NAME TYPE VALUE
-----------------------------------------------------------------------------
Lock_sga boolean FALSE
Pre_page_sga boolean FALSE
Sga_max_size big integer 4800 M
Sga_target big integer 0
 
SQL> create pfile = '/tmp/pfile. ora' from spfile;
 
The file has been created.
 
SQL> host
[Oracle @ localhost db_1] $ cd/tmp
[Oracle @ localhost tmp] $ ls
Mapping-root pfile. ora scim-panel-socket: 0-root
[Oracle @ localhost tmp] $ mor pfile. ora
Bash: mor: command not found
[Oracle @ localhost tmp] $ more pfile. ora
Export pay. _ db_cache_size = 1610612736
Export pay. _ java_pool_size = 67108864
Repeated pay. _ large_pool_size = 67108864
Export pay. _ oracle_base = '/u01' # ORACLE_BASE set from environment
Repeated pay. _ pga_aggregate_target = 2013265920
Repeated pay. _ sga_target = 3019898880
Repeated pay. _ shared_io_pool_size = 0
Export pay. _ shared_pool_size = 1207959552
Repeated pay. _ streams_pool_size = 0
*. Audit_file_dest = '/u01/admin/Alibaba pay/adump'
*. Audit_trail = 'db'
*. Compatible = '11. 2.0.0.0'
*. Control_files = '/u01/oradata/Alibaba pay/control01.ctl', '/u01/flash_recovery_area/Alibaba pay/control02.ctl'
*. Db_block_size = 8192
*. Db_domain =''
*. Db_name = 'your pay'
*. Db_recovery_file_dest = '/u01/flash_recovery_area'
*. Db_recovery_file_dest_size = 10737418240
*. Diagnostic_dest = '/u01'
*. Dispatchers = '(PROTOCOL = TCP) (SERVICE = intopayXDB )'
*. Memory_target = 5033164800
*. Nls_language = 'simplified CHINESE'
*. Nls_territory = 'China'
*. Open_cursors = 300
*. Processses = 1500
*. Remote_login_passwordfile = 'clusive'
*. Sessions = 1655
*. Undo_tablespace = 'undotbs1'
[Oracle @ localhost tmp] $ exit
Exit
 
SQL> shutdown immediate
The database has been closed.
The database has been detached.
The ORACLE routine has been disabled.
SQL> startup mount
The ORACLE routine has been started.
 
Total System Global Area 5010685952 bytes
Fixed Size 2212936 bytes
Variable Size 3355446200 bytes
Database Buffers 1610612736 bytes
Redo Buffers 42414080 bytes
The database has been loaded.
SQL> ALTER SYSTEM SET sga_max_size = 6442450944 COMMENT = 'internally adjusted 'SCOPE = SPFILE SID = 'prop pa ′;
Alter system set sga_max_size = 6442450944 COMMENT = 'internally adjusted 'SCOPE = spfile sid = '0000pa ′
*
Row 3 has an error:
ORA-01756: the string in the quotation marks does not end properly
 
SQL> ALTER SYSTEM SET sga_max_size = 6442450944 COMMENT = 'internally adjusted 'SCOPE = SPFILE SID = 'prop pa ′;
Alter system set sga_max_size = 6442450944 COMMENT = 'internally adjusted 'SCOPE = spfile sid = '0000pa ′
*
Row 3 has an error:
ORA-02095: Unable to modify the specified initialization parameter
 
SQL> alter system set sga_max_size = 6442450944 scope = spfile;
 
The system has been changed.
 
SQL> show parameter sga;
 
NAME TYPE VALUE
-----------------------------------------------------------------------------
Lock_sga boolean FALSE
Pre_page_sga boolean FALSE
Sga_max_size big integer 4800 M
Sga_target big integer 0
SQL> ALTER SYSTEM SET sga_target = 6442450944 SCOPE = SPFILE;
 
The system has been changed.

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