RMAN shared_pool or large_pool

Question

Hi, I want RMAN to use LARGE_POOL to allocate buffers instead of SHARED_POOL.
I use :
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
On Windows 2000.
SQL> show parameters large_
NAME TYPE VALUE
large_pool_size big integer 52M
SQL> show parameters io_slaves
NAME TYPE VALUE
backup_tape_io_slaves boolean FALSE
dbwr_io_slaves integer 1
So after reading notes : 134214.1 47326.1 and 73354.1 I thought that RMAN will use the large_pool but when I check using:
select * from v$sgastat where pool='large pool';
POOL NAME BYTES
large pool krcc extent chunk 2068480
large pool PX msg pool 206208
large pool CTWR dba buffer 385024
large pool free memory 51866240
and run a RMAN backup, the free memory does not decrease,
but
select * from v$sgastat where pool='shared pool' and name='free memory' decrease during backup and increase when RMAN finished.
So from my point of views RMAN still use the shared_pool.
Did I miss something or miss understood something ?
Regards

Answer 1

Hi Aron, no BACKUP_TAPE_IO_SLAVES = FALSE because I use disks backup only.
I found in note 336313.1 that my sizing for large_pool_size was not enought:
LARGE_POOL_SIZE = (No:channels * (16 + 4)) +16 Mb
I use 2 disk channels so my 52Mb was not good I increase to 60Mb
SQL> show parameters larg
NAME TYPE VALUE
large_pool_size big integer 60M
But the result is still the same when RMAN run :
SQL> select * from v$sgastat where pool='large pool';
POOL NAME BYTES
large pool krcc extent chunk 2068480
large pool PX msg pool 206208
large pool CTWR dba buffer 385024
large pool free memory 60254848
I can find KSFQ buffer in this pool.
when I do :
SQL> select * from v$sgastat where name like '%KSFQ%';
POOL NAME BYTES
shared pool X$KSFQP ANCHOR 52
shared pool KSFQ buffer pool 2376
We can see that only few bytes are allocated in the shared_pool.
I have no errors in the alert.log during backup nor at RMAN level.
I just want to know how to check where RMAN buffers are allocated.
Regards