1)From Oracle Universal Installer: In OUI select installed products and click on list and expand, you will see a list of options installed in database.
You have to use OUI to check whether Oracle Secure Enterprise Search is installed or not.
TIP: Start Oracle Universal Installer from your system prompt (UNIX) with the following command:
./runInstaller
2)From v$option:
SQL> set pages 100
SQL> select * from v$option;
PARAMETER VALUE
—————————————————————- —–
Partitioning TRUE
Objects TRUE
Real Application Clusters FALSE
Advanced replication TRUE
Bit-mapped indexes TRUE
Connection multiplexing TRUE
Connection pooling TRUE
Database queuing TRUE
Incremental backup and recovery TRUE
Instead-of triggers TRUE
Parallel backup and recovery TRUE
Parallel execution TRUE
Parallel load TRUE
Point-in-time tablespace recovery TRUE
Fine-grained access control TRUE
Proxy authentication/authorization TRUE