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UNIX interaction with the Multi-threaded Server

As you may know, the Multi-threaded server (MTS) was developed in Oracle7 to provide an alternative to a dedicated server connection for Oracle processes.  Instead of each connection spawning a UNIX PID and a UNIX RAM region for PGA memory, the MTS allows for us to share pre-spawned Oracle connections. These pre-spawned connections share RAM memory by using the Oracle large pool.  By sharing connections and RAM memory, Oracle connections can happen faster and with less overall resource consumption on the server.

When using the MTS, Oracle allocates memory in a shared region called the User Global Area, or UGA.  If you have the large_pool_size defined in you init.ora file, then the UGA memory will be allocated from the large pool.  If you do not define a large pool, then the UGA memory will be allocated from the Oracle shared pool.  Oracle always recommends that you allocate a large pool if you are using the MTS.

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

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