Granule
From Oracle FAQ
A granule is a unit of contiguous virtual memory. The size of a granule is 4MB if the SGA size is less than 128MB, otherwise it will be 16MB.
In some cases Oracle will round-up memory values to the next granule size. For example, the Buffer Cache, Shared Pool, Large Pool and Java Pool can only grow or shrink based on granule boundaries.
The minimum SGA size is three granules, based on:
- One Granule for Fixed SGA (includes redo buffers)
- One Granule for Buffer Cache
- One Granule for the Shared Pool
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