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ORACLE Tutorials

Difference between Session, Connection and Process in Oracle

Difference between Session, Connection and Process
A connection is a physical circuit between you and the database. A connection might be
one of many types -- most popular begin DEDICATED server and SHARED server. Zero, one or
more sessions may be established over a given connection to the database as show above
with sqlplus. A process will be used by a session to execute statements. Sometimes
there is a one to one relationship between CONNECTION->SESSION->PROCESS (eg: a normal
dedicated server connection). Sometimes there is a one to many from connection to
sessions (eg: like autotrace, one connection, two sessions, one process). A process does
not have to be dedicated to a specific connection or session however, for example when
using shared server (MTS), your SESSION will grab a process from a pool of processes in
order to execute a statement. When the call is over, that process is released back to
the pool of processes.

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