Modifikasi Mx Old. Database System Development Lifecycle (DSDLC) merupakan suatu metode untuk perancangan dan pengembangan basis data. Sistem informasi buku tamu di badan pusat statistik kabupaten kediri ini menggunakan Relational Database Management System (RDBMS) MySQL. Database system development Lifecycle (DSDLC) is a method for designing and developing databases. The guest book information system at Kediri Central Agency of Statistics uses MySQL Relational Database Management System (RDBMS). In this research, there are 4 (four) commands was implemented in Guestbook Information System Database, namely Select, Insert, Update and Delete. .