设置sga_target和sga_max_size

SQL> show parameter sga;  #查看当前的值

设置新的值

建议大小为服务器总内存的70%

SQL> alter system set sga_max_size=10G  scope=spfile;
SQL> alter system set sga_target=10G  scope=spfile;

重启Oracle

shutdown immediate;
startup;