SQL> show sga
Total System Global Area
Fixed Size
Variable Size
Database Buffers
Redo Buffers
SQL> alter system set sga_max_size=
System altered
SQL> shutdown immediate;
SQL> startup
SQL> show sga
Total System Global Area
Fixed Size
Variable Size
Database Buffers
Redo Buffers
From:http://tw.wingwit.com/Article/program/Oracle/201311/18817.html