Step by step to install XDB in Oracle 11gr2

Step1: First check that XML Database already installed or not

SQL> select comp_name from dba_registry;

COMP_NAME
----------------------------------------
OWB
Oracle Application Express
Oracle Enterprise Manager
OLAP Catalog
Spatial
Oracle Multimedia
Oracle Text
Oracle Expression Filter
Oracle Rules Manager
Oracle Workspace Manager
Oracle Database Catalog Views
Oracle Database Packages and Types
JServer JAVA Virtual Machine
Oracle XDK
Oracle Database Java Packages
OLAP Analytic Workspace
Oracle OLAP API

17 rows selected.


Step2: Install XML Database 

XDB Installation

The catqm.sql script requires the following parameters be passed to it when run:

A. XDB user password
B. XDB user default tablespace
      (Any tablespace other than SYSTEM, UNDO and TEMP can be specified.
       The specified tablespace must already exist prior to running the script.)
C. XDB user temporary tablespace
D. SecureFiles = YES or NO
      (If YES is specified, the XDB repository will use SecureFile storage.
       If NO is specified, LOBS will be used.
       To use SecureFiles, compatibility must be set to 11.2.
       The tablespace specified for the XDB repository must be using
       Automatic Segment Space Management (ASSM) for SecureFiles to be used.)

Therefore the syntax to run catqm.sql is the following:
SQL> catqm.sql A B C D

For Example:
SQL> @?/rdbms/admin/catqm.sql XDB XDB TEMP YES

## IMPORTANT: You must shutdown and restart the database between removal and reinstall ##

SQL> spool xdb_install.log
SQL> set echo on;
SQL> connect / as sysdba
SQL> shutdown immediate;
SQL> startup;
SQL> @?/rdbms/admin/catqm.sql
SQL> @?/rdbms/admin/utlrp.sql
SQL> spool off



Step3: Now check that XML Database successfully installed or not

SQL> select comp_name , status from dba_registry;

COMP_NAME                                STATUS
---------------------------------------- --------------------------------------------
Oracle XML Database                      VALID
OWB                                      VALID
Oracle Application Express               VALID
Oracle Enterprise Manager                VALID
OLAP Catalog                             VALID
Spatial                                  VALID
Oracle Multimedia                        VALID
Oracle Text                              VALID
Oracle Expression Filter                 VALID
Oracle Rules Manager                     VALID
Oracle Workspace Manager                 VALID
Oracle Database Catalog Views            VALID
Oracle Database Packages and Types       VALID
JServer JAVA Virtual Machine             VALID
Oracle XDK                               VALID
Oracle Database Java Packages            VALID
OLAP Analytic Workspace                  VALID
Oracle OLAP API                          VALID

18 rows selected.

SQL>


Ref: Oracle Doc ID 1292089.1