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Primary Note: Overview of Oracle Background Processes (Doc ID 1503146.1)

Last updated on AUGUST 20, 2021

Applies to:

Oracle Database Cloud Service - Version N/A and later
Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Information in this document applies to any platform.


The background processes of the Oracle instance manage memory structures, asynchronously perform I/O to write data to a file on a disk, and perform general maintenance tasks.

The purpose of this Document is to provide an overview of Oracle Background Processes. This note will help customers have a better understanding of what they are and the functions of some of the main Oracle Background Processes.

This is a LIVE document. Work is in progress to improve the quality of the content.


This document applies to a single instance environment and looks at a basic typical database configuration.


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In this Document
 Overview of Background Processes
 Mandatory Background Processes
 Optional Background Processes
 Secondary Processes
 Specifying the Maximum Number of Processes
 New Background Processes

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