Evolution of Oracle Homes

Learn about read-only Oracle home concepts like ORACLE_BASE_HOME and ORACLE_BASE_CONFIG.

• About Read-Only Oracle Homes
  In Oracle Database 21c, an Oracle Database installation configures all Oracle Database homes in read-only mode by default. A read-only Oracle home does not imply that the file system and the Oracle home is in read-only mode. The file system and mount point should always be in read/write mode.
• About Oracle Base Homes
  In a read-only ORACLE_HOME, the user-specific files, instance-specific files, and log files reside in a location known as the ORACLE_BASE_HOME.
• About Oracle Base Config
  In a read-only ORACLE_HOME, the configuration files reside in a location known as ORACLE_BASE_CONFIG.