in database 11g database vault installation become more easier, all you have to do is check the box to install that option and even if you forgot that you can install it later by run script
the below is screen shot for the installation for database 11g , the idea is to see where to choose Database Vault features:
SQL> select * from v$option where parameter =’Oracle Database Vault’;
PARAMETER VALUE
——————————- ——————————–
Oracle Database Vault FALSE
to enable database vault make sure database , dbconsole and listener are shutdown:
[oracle@prim u01]$ cd /u01/app/oracle/product/11.2.0/db_1/rdbms/lib/
[oracle@prim lib]$ make -f ins_rdbms.mk dv_on lbac_on ioracle
SQL> select * from v$option where parameter =’Oracle Database Vault’;
PARAMETER VALUE
—————————————————————-
Oracle Database Vault TRUE
cd $ORACLE_HOME/rdbms/lib
make -f ins_rdbms.mk dv_off
cd $ORACLE_HOME/bin
relink all