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You have executed this command to change the size of the database buffer cache: SQL> ALTER SYSTEM SET DB_CACHE_SIZE=2516582; System altered. To verify the change in size, you executed this command: Why is the value set to 4194304 and not to 2516582?
Correct Answer: A
Explanation/Reference: Explanation: Regardless of whether you are using automatic or manual memory management, you'll find that memory is allocated to the various pools in the SGA in units called granules. A single granule is an area of memory of 4MB, 8MB, or 16MB in size. The granule is the smallest unit of allocation, so if you ask for a lava pool of 5MB and your granule size is 4MB. Oracle will actually allocate 8MB to the lava pool (8 being the smallest number greater than or equal to 5 that is a multiple of the granule size of 4). The size of a granule is determined by the size of your SGA (this sounds recursive to a degree, as the size of the SGA is dependent on the granule size). Vim can view the granule sizes used for each pool by querying V$SGA_DYNAMIC_COMPONENTS. In fact, we can use this view to see how the total SGA size might affect the size of the granules: