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数据库版本 11.1.0, 最初配置时使用的手动设定内存参数，在调整其为全自动内存参数设置过程中，发生了：
ORA-00824: cannot set SGA_TARGET or MEMORY_TARGET due to existing internal settings, see alert log for more information
(原文链接 http://ddbiz.com/?p=103)
的错误信息，过程如下：
SQL> alter system set memory_max_target=2g scope=spfile;
System altered.SQL> alter system set memory_target=1600m scope=spfile;
System altered.
SQL> alter system set pga_aggregate_target=0 scope=spfile;
System altered.
SQL> alter system set sga_target=0 scope=spfile;
System altered.
SQL> shutdown immediate
SQL> startup
ORA-00824: cannot set SGA_TARGET or MEMORY_TARGET due to existing internal settings, see alert log for more information
出现这个错误是因为 spfile.ora 中定义了 db_block_buffers 参数，从配置中删除此参数即可：
SQL> create pfile='pfile.ora' from spfile;
File created
SQL> host vi pfile.ora
#
# 删除 db_block_buffers 配置
#
SQL> startup pfile='pfile.ora';
Total System Global Area 2137886720 bytes
Fixed Size 2146112 bytes
Variable Size 1409286336 bytes
Database Buffers 721420288 bytes
Redo Buffers 5033984 bytes
Database mounted.
Database opened.
SQL> create spfile from pfile='pfile.ora'
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