How to get ORACLE_HOME from data dictionary
SQL> set autopri on
SQL> var oracle_home varchar2(255)
SQL> exec dbms_system.get_env('ORACLE_HOME',:ORACLE_HOME)
PL/SQL procedure successfully completed.
ORACLE_HOME
--------------------------------------------------------------------------------
/app/oracle/oracle/product/10.2.0/db_2
[@more@]
SQL> var oracle_home varchar2(255)
SQL> exec dbms_system.get_env('ORACLE_HOME',:ORACLE_HOME)
PL/SQL procedure successfully completed.
ORACLE_HOME
--------------------------------------------------------------------------------
/app/oracle/oracle/product/10.2.0/db_2
[@more@]
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