Oracle — The Best Secure Storage For Your Confidential Data
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Major Oracle Database’s background processes
The major background processes of an Oracle instance are explained below:
- PMON is the process monitor that regulates all other operations. PMON cleans up abnormally interconnected database connections and automatically records a database instance with the listener operation. PMON is a process that must be active in an Oracle database.
- SMON is the system monitor process that functions in system-level clean-up operations. It has two primary commitments including automatic instance recovery in the event of a failed instance, e.g., power failure and dumping up of temporary files.
- DBWn is a database writer. Oracle executes every operation in memory instead of the disk because processing in memory is quicker and more efficient than processing on disk. The DBWn approach reads data from the disk and writes it back to the disk. An Oracle instance has numerous database writers like DBW0, DBW1, DBW2, etc.
- CKPT is a checkpoint process. In Oracle, data that is on disk is called a block, and the data in memory is called a buffer. When a block is written to the buffer and modified, the buffer becomes dirty, and it must be written down to the disk. The CKPT process updates the control over that and the data file headers with checkpoint data as well as signals writing of dirty buffers to disk.
(Note: Oracle 12c allows full as well as incremental checkpoints.)
- LGWR is the log writer operation which is the key to the recoverability architecture. Every change that occurs in the database is written out to a file known as a redo log for recovery objectives. And all these transformations are written and logged by the LGWR process. The LGWR process foremost writes the changes to memory and then disk as redo logs which then can be utilized for recovery.
- ARCn is the archiver process that replicates the content of redo logs to archive redo log files. The archiver method can have multiple processes such as ARC0, ARC1, and ARC3, which permit the archiver to write to different destinations such as D: drive, E drive, etc.
- MMON is the manageability monitoring function that collects performance metrics.
- MMAN is the memory manager that automatically handles memory in an Oracle database.
- LREG is the listener registration technique that registers information on the database instance initially and the dispatcher processes it with the help of Oracle Net Listener.
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