1.切换到oracle账号下
2.运行sqlplus / as sysdba
-- 备份参数文件
create pfile='/tmp/initprd.ora' from spfile;
-- 修改参数
alter system set log_buffer=134217728 scope=spfile;
alter system set sga_max_size=64G scope=spfile;
alter system set sga_target=64G scope=spfile;
4.shutdown immediate
5.startup
6.如果启动失败使用： startup pfile='/tmp/initprd.ora'
