How to Calculate Rman Memory Allocation In Large Pool
from metalink
Contrary to the rman documentation at 9i, the amount of memory required by RMAN to be set aside
in LARGE POOL when asynchronous io is simulated with the use of slaves is NOT 16Mb per channel.
For a disk backup:
Each channel is allocated 4*1Mb (output buffers) plus 16*1Mb (input buffers)
For a tape backup:
Each channel is allocated 4*
Additionally, when the controlfile is included in the backup the memory allocated jumps by a
further 16 Mb (for the channel doing the controlfile backup) to 32Mb plus the output buffers
(tape or disk).
Bug 4513611 (still with Development) has been raised to clarify the documentation and
confirm if this is expected behaviour.
In the meantime, to cater for all circumstances, large pool should be set as follows (bearing in
mind that the controlfile can only be backed up by one channel) :
For disk channels
LARGE_POOL_SIZE = (No:channels * (16 + 4)) +16 Mb
For tape channels:
LARGE_POOL_SIZE = (No:channels * (16 + 4(
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