Hi,
U can create a database by using the create database with load option and when u create a database check Mydb size and create one "Mydb_UAT" with similar size and load the database mydb in mydb_UAT.
suppose if your database name dump name is /backup/mydb.dmp then u can load as
1>load database mydb_UAT from "backup/mydb.dmp" 2>go