1Z0-497 Question #142: Real Exam Question with Answer & Explanation

Question

Options

• APMON performs process recovery when a client process fails.
• BDuring instance startup, PMON takes care of instance recovery.
• CPMON performs listener registration.
• DPMON restarts background and dispatcher processes when they fail.
• EPMON resolves failures of distributed transactions.

Explanation

Process Monitor Process (PMON) The process monitor (PMON) monitors the other background processes and performs process recovery when a server or dispatcher process terminates abnormally. PMON is responsible for cleaning up the database buffer cache and freeing resources that the client process was using. For example, PMON resets the status of the active transaction table, releases locks that are no longer required, and removes the process ID from the list of active processes. Listener Registration Process (LREG) The listener registration process (LREG) registers information about the database instance and dispatcher processes with the Oracle Net Listener. When an instance starts, LREG polls the listener to determine whether it is running. If the listener is running, then LREG passes it relevant parameters. If it is not running, then LREG periodically attempts to contact it. Note: In releases before Oracle Database 12c, PMON performed the listener registration. PMON periodically checks the status of dispatcher and server processes, and restarts any that have stopped running (but not any that Oracle Database has terminated intentionally).

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