Learn about read-only Oracle home concepts like Oracle base home, Oracle base config, and orabasetab.

• About Read-Only Oracle Homes
  Starting with Oracle Database 21c, an Oracle Database installation configures all Oracle Database homes in read-only mode by default.
• About Oracle Base Home
  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.
• About orabasetab
  The orabasetab file is used to define fundamental directories based on $ORACLE_HOME, ORACLE_BASE, ORACLE_BASE_HOME and ORACLE_BASE_CONFIG.