Have you ever thought about what happened behind the scenes when you search databases on your library’s online catalog? Exlibris, a ProQuest Company manages about more than 15,000 titles of databases and provide libraries with title metadata. The company recently developed a new back-end tool which aims to better serve its clients. The goal of our project is to develop an efficient data migration strategy and migrate metadata from the old tool into the new one. Since the library’s online catalog are becoming an integral part of our professional life, we are hoping to make it more convenient for everyone.