Creating new DB2 Data Base and Instance AND Delete existing DB2 Data Base Instance.

Before Creating new DB2 Data Base and Instance, Need to delete existing DB2 Data Base Instance.

Step 1 : Delete Existing DB2 Data Base and Instance
1. Login to db user and run below commands
     $db2start
     $db2 force application all
     $db2 drop db SAMPLE(database name)
     $db2stop force
     $su - root
     #cd /opt/IBM/db2/V9.7/instance/
     #db2idrop Instance_Name
Step 2 : Creating New DB2 Instance and Data Base

 2. Login to root user
     #cd /opt/IBM/db2/V9.7/instance/
     #db2icrt -p 50001 -u db2fenc1 Instance_Name (New Instance Name)
     #db2icrt -p 60004 -u db2tfenc instance_Name (New Instance Name)
Output :
 DBI1070I  Program db2icrt completed successfully.
     #su - db2user
     $db2start
     $db2 create db DATABASE-NAME(UATDB)
Output :
 DB20000I  The CREATE DATABASE command completed successfully.


Reference : 

For finding instance name visit following link