Oracle's connection and session and process
1.process:connection断了，process也可以存在
2.session:仅当你connection时，才会保持session.
3.connection:"physical circuit",1个connection对应0个或者1个或者多个session
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.
可以参见asktom:asktom.oracle.com/pls/asktom/f
编写于【2009-01-15】