chopt utility

(originally published at Pythian)
There is a new tool came with Oracle 11g Rel.2 that helps to modify options in
installed oracle home (Enabling and Disabling Database Options)
It is very simple and straightforward utility that recompiles database kernel
with different flags.

[oracle@r1 bin]$ chopt
usage:
chopt  <enable|disable> <option>
options:
                  dm = Oracle Data Mining RDBMS Files
                  dv = Oracle Database Vault option
                lbac = Oracle Label Security
                olap = Oracle OLAP
        partitioning = Oracle Partitioning
                 rat = Oracle Real Application Testing
e.g. chopt enable rat

There is no "list" command that can show installed options for the selected home
although it can be helpful and useful to have such option.

Initially enabled options can possibly be seen in $ORACLE_HOME/install/make.log file
(flags were set as compilation options for ins_rdbms.mk) but it can be changed over time
and not always relfect the current configuration.

Knowing that there is XML file for properties of oracle home wouldn't be
$ORACLE_HOME/inventory/ContentsXML/oraclehomeproperties.xml
a good place to track list of oracle home configured options?

And finally the tool does not take into account several options at once, it simply ignores
all parameter after the second one:

[oracle@r1 bin]$ chopt enable dm dv

Writing to /u01/app/oracle/product/11.2.0/dbhome_1/install/enable_dm.log...
/usr/bin/make -f /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/ins_rdbms.mk dm_on
 ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1
/usr/bin/make -f /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/ins_rdbms.mk ioracle
 ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1/
[oracle@r1 bin]$

Have a good day!