as shayam told , U can rename DB by using db2relocatedb
Here is syntax & example for rename DB is as below.
To change the name of the database TESTDB to PRODDB in the instance db2inst1 that resides on the path /home/db2inst1, create the |following configuration file:
DB_NAME=TESTDB,PRODDB
DB_PATH=/home/db2inst1
INSTANCE=db2inst1
NODENUM=0
Save the configuration file as relocate.cfg and use the following command to make the changes to the database files:
db2relocatedb -f relocate.cfg
Hope it may help.
Lekharaju Ennam
Certified Oracle8i & DB2 UDB DBA
Florida A&M University