Re: FSI TX200 S2 and main memory > 4 GB

On Wednesday 20 June 2007 06:16:01 pm Pinault, Damien wrote:
> On a  HP DL580 with 12 GB of RAM ( Intel Xeon - 32 bits),
> We are running the following config in a demo environment without any
> major incidents.
>
> * PAE is enabled at the hardware level ( probably not relevant for EM64T
> )
>   and you use a big-smp kernel (2.6.5-7.257-bigsmp)
>
> * You increase /proc/sys/kernel/shmmax to something like 4294967295
>   and /proc/sys/kernel/shmall to something like    2097152
>
> * You use indirect buffers && "old style memory" allocation in your
> init.ora
>
> use_indirect_data_buffers=TRUE ( Big performance hit I guess)
> db_block_buffers=445000
> db_block_size=8192
>
> We can open a database till 6 GB of SGA.
> (our SGA is 4.3 GB right now in this environment though).

With a similar setup (indirect_data_buffers), we're getting random ORA-07445 
errors.  These appeared after we have changed to VLM.

We have opened a SR with Oracle and they said that the errors are caused by 
the stack not being able to grow down anymore.  That is grow towards lower 
memory addresses.

They have recommended we lower the mapped base.

In a RAC environment this can be done with a messy kludge.

My question is, does everything appear to be running well on your machine?


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