1.1 ASMM的管理对象为SGA(shared pool;buffer pool;large pool;java pool;stream pool;redo buffer pool).注：不包含缓冲池(Keep buffer pool;Recycle buffer pool;nK buffer pool)
1.2 设置ASMM的管理i)从手动共享内存管理模式下启用ASMMi1) 获取SGA_TARGET的值： SELECT ((SELECT SUM(value) FROM V$SGA) - (SELECT CURRENT_SIZE FROM V$SGA_DYNAMIC_FREE_MEMORY)) "SGA_TARGET" FROM DUAL;         i2) 使用该值设置SGA_TARGET。i3) 将（SHARED_POOL_SIZE,LARGE_POOL_SIZE,JAVA_POOL_SIZE,DB_CACHE_SIZE,STREAMS_POOL_SIZE）值设置为0。             ii)从自动内存管理模式(AMM)切换到ASMMii1)将初始化参数MEMORY_TARGET 设置为0。ALTER SYSTEM SET MEMORY_TARGET = 0;数据库将根据当前的SGA 内存分配设置SGA_TARGET。ii2)将自动设置大小的SGA组件(shared pool;buffer pool;large pool;java pool;stream pool;redo buffer pool)的值设置为0。完成后，重新启动实例

1.1 AMM的管理对象为SGA(shared pool;buffer pool;large pool;java pool;stream pool;redo buffer pool)+PGA。注：此时sga_target为0无意义
1.2 设置AMM的管理 1.用sqlplus以sysdba链接数据库2.计算MEMORY_TARGET的最小值a.确定当前的 SGA_TARGET 和 PGA_AGGREGATE_TARGETSQL> show parameter targetNAME                                 TYPE        VALUE------------------------------------ ----------- ----------------archive_lag_target                   integer     0db_flashback_retention_target        integer     1440fast_start_io_target                 integer     0fast_start_mttr_target               integer     0memory_max_target                    big integer 0memory_target                        big integer 0parallel_servers_target              integer     16pga_aggregate_target                 big integer 90Msga_target                           big integer 272Mb.查询从数据库启动以来最大的PGA  select value from v$pgastat where name='maximum PGA allocated';c.计算MEMORY_TARGETmemory_target = sga_target + max(pga_aggregate_target, maximum PGA allocated)例如：SGA_TARGET = 272M ； PGA_AGGREGATE_TARGET = 90M , 且 maximum PGA allocated 为 120M, 那么 MEMORY_TARGET >= 392M (272M + 120M). 3.参照2c，修改memory_target的值ALTER SYSTEM SET MEMORY_TARGET=392M;1.3 MEMORY_TARGET,SGA_TARGET和PGA_AGGREGATE_TARGET之间的关系如果将SGA_TARGET和PGA_AGGREGATE_TARGET设置为非零值，则可将其分别视为SGA和PGA大小的下限值。MEMORY_TARGET 可以采用从SGA_TARGET+PGA_AGGREGATE_TARGET到MEMORY_MAX_SIZE的值