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RDBMS Online Patching Aka Hot Patching (Doc ID 761111.1)

Last updated on APRIL 04, 2021

Applies to:

Oracle Database - Enterprise Edition
Oracle Universal Installer - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Microsoft Windows x64 (64-bit)
Linux Itanium
Oracle Solaris on SPARC (64-bit)
IBM AIX on POWER Systems (64-bit)
Microsoft Windows (32-bit)
Linux x86
Linux on IBM Z
HP-UX Itanium
IBM: Linux on POWER Big Endian Systems
Oracle Solaris on x86-64 (64-bit)
Linux x86-64
Microsoft Windows (32-bit)


This document explores the new feature Online Patching (hot patching) for RDBMS. Online Patching is a new feature introduced in
It will be delivered starting with RDBMS


For Support Engineers and Oracle Database Senior Administrators to understand and utilize Online Patching.


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In this Document
 Online Patches for the RDBMS
 How does Online Patching differ than traditional patches?
 How Does the Online Patch Mechanism Work ?
 Required Support from the OS
 Limitations & Restrictions
 Debugging & Diagnostics
 Patch State
 Memory requirement for online patches
 OPatch - How are Online Patches Installed?
 How do I know what online patches are installed and what state are they in?
 How to apply an online patch on several databases
 How to disable or remove the fix from some SIDs
 How do I know which patches are eligible to be applied online?
 How are Online Patches rollback'ed?
 What are the key files regarding Online Patch?
 Online Patching Best Practices
 Why isn't every patch an online patch?
 Known Issues

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