Pin redo logs into smart flash cache (Exadata Flash PCI F20 cache)

Need to know if we could pin redo logs into smart flash cache.
For example to pin table..
we use Alter table dhaval storage (cell_flash_cache keep) -----
Similarly can we pin redo logs into flash cache ?
If not, what is the alternative to put redo logs into flash cache ?

At Oracle OpenWorld the Exadata Smart Flash Log feature was announced. The Smart Flash Log feature requires Exadata Storage 11.2.2.4.0 or later, and Databases version 11.2.0.2 Bundle Patch 11 or greater. This feature allows a modest amount of flash to be used as a secondary write place. It wites redo to both flash and disk and returns the call to the db for the first one that finishes. By doing so it improves user transaction response time, and increases overall database throughput for IO intensive workloads.
Regards,
Greg Rahn
http://structureddata.org

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Flash Cache feature is available in both 11gR2 & Exadata. The difference being in 11gR2 it is an extension of the database buffer, however in Exadata it is a separate hardware component in the storage server.
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Edited by: museshad on Jun 8, 2011 2:13 PM

Exadata Smart Flash Cache and Database Smart Flash Cache use SSD advantages.
On Exadata, We don't need to change anything in Database (database machine). We just "create flashcache" on cell. and Exadata Environment not support 11gR2 feature (Database Smart Flash Cache), Because it has Exadata Smart Flash Cache.
http://surachartopun.com/2011/02/how-to-use-exadata-smart-flash-cache.html
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db_flash_cache_file
db_flash_cache_size
http://surachartopun.com/2010/02/oracle-11gr2-flash-cache.html
Flash Cache feature is available in both 11gR2 & Exadata. On Exadata, we use Exadata SMart Flash Cache.
On None Exadata, we use database smart flash cache.
*** Exadata Environment not support 11gR2 feature (Database Smart Flash Cache) ***
The difference being in 11gR2 it is an extension of the database buffer, however in Exadata it is a separate hardware component in the storage server.when we get data, we read from disks to database buffer, when blocks are evicted from database buffers, they are stored in flash cache. After that ... someone get data again -> oracle read in database buffer cache, if not found, then oracle read in flash cache(if not found, oracle read from disks)
read more:
http://www.oracle.com/technetwork/articles/systems-hardware-architecture/oracle-db-smart-flash-cache-175588.pdf
http://www.oracle.com/technetwork/middleware/bi-foundation/exadata-smart-flash-cache-twp-v5-1-128560.pdf
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Is there any way that Oracle can write to datafiles in the middle of a transaction?
Iam reading, processing and writing very large sized lobs which gives error that "no free buffers available in buffer pool".
When in lobs, a lob is not written until the whole tranaction finishes - but in my case the lob size is large than the size of the data buffer cache.
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Is there any way that Oracle can write to datafiles
in the middle of a transaction?
r.- Oracle writes to the datafiles only commited transactions according to some elements
Iam reading, processing and writing very large sized
lobs which gives error that "no free buffers
available in buffer pool".
r.- You have to increase the size of the buffer Pool
When in lobs, a lob is not written until the whole
tranaction finishes - but in my case the lob size is
large than the size of the data buffer cache.
The error is "ORA-00379: no free buffers available in
buffer pool DEFAULT for block size 8K"
Exact question I would like to know now is that which
buffer is full; data_buffer_cache or the redo log
buffer?
data_buffer_cache. In what version you are ?
If data_buffer cache, then is there a mechanism which
allows to write data to dtafiles in the middle of a
transaction as i have to do processing with lobs -
which are 3 to 4 times the size of the db cache
size.
r.- Oracle does not write to the datafiles in that way
I am referring to the same problem outlined in an
earlier thread.
Thanks Joel PÃ©rez
http://www.oracle.com/technology/experts

Online redo logs in Flash Recovery Area

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4 ONLINE
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IS_
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user492400 wrote:
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Disk array configurations with oracle redo logs and flash recovery area.

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Pin redo logs into smart flash cache (Exadata Flash PCI F20 cache)

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