Re: db_file_multiblock_read_count value

Right from the Oracle docs.......

The max value for DB_MULTIBLOCK_READ_COUNT on Solaris is MIN(DB_BLOCK_BUFFERS/4,1048576/DB_BLOCK_SIZE) But as has been suggested, a value for this parameter as you are suggesting would be very high....too high.

HTH,
Brian

danilo wrote:
>
> Hi,
> I would like to know why we can't set Oracle parameter
> db_file_multiblock_read_count greater than 128 on a Sun system running
> Solaris 8 (with latest patches) and Oracle 9i release 2.
>
> On the OS side, we set the max. physical I/O size(maxphys) to 8 M in
> /etc/system and sd_max_xfer_size is also set to 8M in the
> /kernel/drv/sd.conf. We tried to set db_file_multiblock_read_count to
> 1024 as recommended by VERITAS (maxphys/Oracle_block_size) = 8 M/8 K
> but Oracle just seems to retain the 128 value.
>
> Does anyone know if this is an Oracle limitation or something else?
>
> Thanks
>
> Danilo
Received on Thu Oct 31 2002 - 10:53:19 CST