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Automatic Shared Memory Management with Oracle 10g

Automatic Shared Memory Management (ASMM) was introduced with Oracle 10g. Its purpose is to automatically find the right size for Therefore, the respective init params java_pool_size, shared_pool_size, large_pool_size and db_cache_size need not be specified anymore.
Also, it seems that db_block_buffers can not be set anymore with ASMM enabled.

Enabling ASMM

ASMM is enabled when sga_target is set to a value higher than 0 and when statistics_level is set to either typical or all
Automatic shared memory management is managed by the mman background process.