Hi Subhash
For renaming the table , you need to run the command as :
RENAME TABLE <schema_name>.<table_name> TO <new_name>
Please see the link below
http://publib.boulder.ibm.com/infocenter/db2luw
/v9/index.jsp?topic=%2Fcom.ibm.db2.udb.admin.doc%2Fdoc%2Ft0005369.htm
For finding the schema name of the table :
db2 " select tabschema from syscat.tables where tabname = 'table name' "
Thanks
Rishi