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Don Burleson Blog 







RMAN large pool PGA RAM tips

Oracle Database Tips by Donald BurlesonMarch 12, 2015

Question:  I have read that we have the parameter (backup_tape_io_slaves = false), and I read that RMAN gets memory space in PGA and not in Large Pool.  Is this correct that RMAN uses PGA RAM when not using I/O slaves?

Answer:  The documentation notes that RMAN allocates the tape buffers in the SGA or the PGA, depending on whether I/O slaves are used, and whether backup_tape_io_slaves is set to true:

"If you set the initialization parameter BACKUP_TAPE_IO_SLAVES = true, then RMAN allocates tape buffers from the SGA or the large pool if the LARGE_POOL_SIZE initialization parameter is set.

If you set the parameter to false, then RMAN allocates the buffers from the PGA.

If you use I/O slaves, then set the LARGE_POOL_SIZE initialization parameter to set aside SGA memory dedicated to holding these large memory allocations.

Hence, the RMAN I/O buffers do not compete with the library cache for SGA memory."

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