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The Process Monitor
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When user processes fail, the process monitor (PMON) process cleans up after them, ensuring that the database frees up the resources that the dead processes were using. For example, when a user process dies while holding certain table locks, the PMON process releases those locks so other users can use the tables without any interference from the dead process. In addition, the PMON process restarts failed server processes and dispatcher processes. The PMON process sleeps most of the time, waking up at regular intervals to see if it is needed. Other processes will also wake up the PMON process if necessary.
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CHAPTER 4 INTRODUCTION TO THE ORACLE DATABASE 10G ARCHITECTURE
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The PMON process automatically performs dynamic service registration. When you create a new database instance, the PMON process registers the instance information with the listener, which is the entity that manages requests for database connections ( 10 discusses the listener in detail). This dynamic service registration eliminates the need to register the new service information in the listener.ora file, which is the configuration file for the listener.
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The System Monitor
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The system monitor (SMON) process, as its name indicates, performs system-monitoring tasks for the Oracle instance, such as these: Upon restarting an instance that crashed, SMON determines whether the database is consistent. SMON coalesces free extents if you use dictionary-managed tablespaces, which enables you to assign larger contiguous free areas on disk to your database objects. SMON cleans up unnecessary temporary segments. Like the PMON process, the SMON process sleeps most of the time, waking up to see if it is needed. Other processes will also wake up the SMON process if they detect a need for it.
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The File Mapping Monitor
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File systems are increasingly complex, and to help you in monitoring I/O, Oracle provides the file mapping monitor (FMON) process to map files to immediate storage layers and physical devices. This will help you understand exactly how your data files are stored in a disk system managed by a Logical Volume Manager (LVM). The FMON process interacts with mapping libraries provided by the operating system to perform the file mapping. The results are in the DBMS_STORAGE_MAP view.
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The Archiver
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The archiver (ARCn) process is used when the system is being operated in an archivelog mode that is, the changes logged to the redo log files are being saved and not being overwritten by new changes. If you run your database in the no archivelog mode, Oracle will overwrite the redo log files with new redo log records. When you choose to run the instance in an archivelog mode, no such overwriting can take place each filled log will be saved or archived in a special location. The archiver process will archive the redo log files to the location you specify. You usually copy these archived logs to tape and send them to an offsite storage location to ensure you have a complete set of backups and archived redo logs so that you can perform a database recovery if the need arises. If a huge number of changes are being made to your database, and your logs are consequently filling up very quickly, you can use multiple archiver processes up to a maximum of ten (ARC0 through ARC9). The LOG_ARCHIVE_MAX_PROCESSES parameter in the initialization file will determine how many archiver processes Oracle will start. If the log writer process is writing logs faster than the default single archiver process can archive them, the LGWR process automatically starts a new ARCn process, thus raising the number of processes from their default value of 1.
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CHAPTER 4 INTRODUCTION TO THE ORACLE DATABASE 10G ARCHITECTURE
If you aren t sure what new background processes are actually running in your database, just check the Tip processes by issuing the ps eaf | grep ora command in UNIX and Linux systems. For each active process, the process name and database name will be listed. For example, the log writer process will show up as ora_lgwr_pasprod, where pasprod is the name of the database. You can get a complete list of all the background processes (running and not running) by querying the V$BGPROCESS view.
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