D.1.1 About Read-Only Oracle Homes
Starting with Oracle Database 18c, you can configure an Oracle home in read-only mode.
In a read-only Oracle home, all the configuration data and log files reside outside of the read-only Oracle home. This feature allows you to use the read-only Oracle home as a software image that can be distributed across multiple servers.
Apart from the traditional ORACLE_BASE and ORACLE_HOME directories, the following directories contain files that used to be in ORACLE_HOME:
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ORACLE_BASE_HOME
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ORACLE_BASE_CONFIG
Benefits of a Read-Only Oracle Home
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Enables seamless patching and updating of Oracle databases without extended downtime.
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Simplifies patching and mass rollout as only one image needs to be updated to distribute a patch to many servers.
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Simplifies provisioning by implementing separation of installation and configuration.
Note:
This feature does not affect how database administrators monitor, diagnose, and tune their system performance.Parent topic: Understanding Read-Only Oracle Homes