what are control files,”Each database has one unique control file that contains data about the database itself (that is, physical database structure information). Multiple copies may be maintained to protect against total loss. It can also contain metadata related to backups. The control file is critical to the database. Without the control file

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Describe the LREG,”Listener Registration ProcessRegisters information about the database instance and dispatcher processes with the Oracle Net ListenerLREG provides the listener with the following information:• Names of the database services• Name of the database instance associated with the services and its current andmaximum load• Service handlers (dispatchers and dedicated servers) available for the instance, including their type, protocol addresses

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Describe the RECO,”Recoverer Process• Used with the distributed database configuration• Automatically connects to other databases involved in in-doubt distributed transactions• Automatically resolves all in-doubt transactions• Removes any rows that correspond to in-doubt transactionsIf the RECO process fails to connect with a remote server, RECO automatically tries to connect again after a timed interval. However

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Describe the PMON,”Process Monitor ProcessPerforms process recovery when a user process fails- Cleans up the database buffer cache- Frees resources that are used by the user process• Monitors sessions for idle session timeoutcleaning up the database buffer cache and freeing resources that the user process was using. For example, it resets the status of the active transaction table, releases locks, and removes the process ID from the list of active processes.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).Like SMON

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