About Configuring an Oracle Home in Read-Only Mode

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Starting with Oracle Database 18c, you can configure an Oracle home in read-only mode. A read-only Oracle home prevents creation as well as modification of files inside the Oracle home directory ORACLE_HOME. A read-only Oracle home can be used as a software image for simplifying patching and mass rollout of software across multiple database servers.

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A traditional read-write Oracle home contains instance-specific files. However, when the Oracle home is read-only, instance-specific files are stored separately in the Oracle base directory ORACLE_BASE. Therefore, a read-only Oracle home can be used as a software image that can be shared across multiple database servers, as it stores only the static files. This simplifies patching and mass rollout as only one Oracle home image needs to be updated to distribute a patch to multiple database servers.

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Apart from the traditional ORACLE_BASE and ORACLE_HOME directories, the following additional directories exist in a read-only Oracle home:

• ORACLE_BASE_HOME: This is a subdirectory within the ORACLE_BASE directory. This directory contains user-specific files, instance-specific files, and log files.
• ORACLE_BASE_CONFIG: This directory is same as the ORACLE_BASE directory. This directory contains instance-specific dynamic files, such as configuration files.

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