Various memory management methods:

Memory Management Mode	For	You Set	Oracle Database Automatically Tunes
Automatic memory management (AMM)	SGA and PGA	Total memory target size for the Oracle instance (MEMORY_TARGET) (Optional) Maximum memory size for the Oracle instance (MEMORY_MAX_TARGET)	Total SGA size SGA component sizes Instance PGA size Individual PGA sizes
Automatic shared memory management (ASMM) (AMM disabled)	SGA	SGA target size (SGA_TARGET) (Optional) SGA maximum size (SGA_MAX_SIZE)	SGA component sizes
Manual shared memory management (AMM and ASMM disabled)	SGA	Shared pool size (SHARED_POOL_SIZE) Buffer cache size (DB_CACHE_SIZE or DB_BLOCK_BUFFERS) Java pool size (JAVA_POOL_SIZE) Large pool size (LARGE_POOL_SIZE) (Optional) SGA maximum size (SGA_MAX_SIZE)	None
Automatic PGA memory management	PGA	Instance PGA target size (PGA_AGGREGATE_TARGET)	Individual PGA sizes
Manual PGA memory management (Not recommended)	PGA	Maximum work area size for each type of SQL operator	None