配置oracle的asmm管理

-- 关闭AMM
alter system set memory_target=0 scope=spfile;
alter system set memory_max_target=0 scope=spfile;

-- 配置ASMM（SGA自动管理）
alter system set sga_target=2048M scope=spfile;
alter system set sga_max_size=2048M scope=spfile;

-- 配置自动PGA管理
alter system set pga_aggregate_target=1024M scope=spfile;
alter system set pga_aggregate_limit=2048M scope=spfile;