Abstract: Embodiments include systems and methods for performing rules based scheduling and migration of databases based on complexity and weight. Information about source databases from a source system can be stored, the stored information including storage capacity information and downtime information for the source databases. Each of the source databases can be classified to one of a plurality of predetermined migration complexities based on the storage capacity information and downtime information. Scheduling weights can be assigned to each class of complexity. A migration schedule can be generated that defines periods of time for migrating data from the source databases, where a rules based scheduling engine generates the migration schedule based on the classified source databases and the assigned scheduling weights, the rules defining a weight criteria for the periods of time. Data can be migrated from the source databases to target databases according to the migration schedule.