![]() ![]() Thus, "Oracle process" does not always mean "operating system process."Ĭlient processes differ in important ways from the Oracle processes interacting directly with the instance. A third operating system process might contain multiple foreground threads. Two foreground processes and a parallel execution (PX) server process might run as threads in a second operating system process. In a database running in threaded mode, PMON and DBW might run as operating system processes, whereas LGWR and CMON might run as threads within a single process. In threaded mode, some background processes on UNIX and Linux run as processes (with each process containing one thread), whereas the remaining Oracle processes run as threads within processes. You must set the THREADED_EXECUTION initialization parameter to TRUE to run the database in threaded mode. When Oracle Database 12 c is installed, the database runs in process mode. Starting in Oracle Database 12 c, the multithreaded Oracle Database model enables Oracle processes to execute as operating system threads in separate address spaces. In releases earlier than Oracle Database 12 c, Oracle processes did not run as threads on UNIX and Linux systems. By dividing the work of the database and applications into several processes, multiple users and applications can connect to an instance simultaneously while the system gives good performance. ![]() Each process in a database instance performs a specific job. Most databases are multiuser because a primary advantage of a database is managing data needed by multiple users simultaneously. Multiprocess Oracle Database (also called multiuser Oracle Database) uses several processes to run different parts of the Oracle Database code and additional Oracle processes for the users-either one process for each connected user or one or more processes shared by multiple users. ![]()
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