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RAM memory fencing in Sun Solaris

On Solaris you can use Intimate Shared Memory (ISM), which will effectively lock the SGA into non-swappable RAM memory. You need to set it up at the OS level (contact Sun Microsystems for details), and at the oracle level you can use the USE_ISM=true init.ora parameter. In Release of Oracle prior to Oracle8i you can set the init.ora parameter use_ism=true. The USE_ISM init.ora parameter was obsoleted in 8.1.3, and in Oracle8i the use_ism becomes a hidden parameter that defaults to TRUE. Memory page locking is implemented in Solaris by setting some bits in the memory page's page structure.
Now that we see the interface details between UNIX and Oracle. Let’s move on and look at how Oracle interacts with the disk I/O sub-system.

The above is an excerpt from the "Oracle UNIX Administration Handbook" by Oracle press, authored by Donald K. Burleson.


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