Towards the development of data migration method for MongoDB and Cassandra databases

The migration of data between NoSQL databases faces challenges due to the heterogeneity of the data schema and storage paradigm between the data-bases. In addition, the flexibility of storage paradigm allows non-standardized schema between records in NoSQL database. For example, in MongoDB, documents within the same collection could have different schema. However, this flexi-schema may cause difficulties in data migration as there is without any standard data schema to follow by for the target data-base during data migration. This paper proposed a migration method ap-plied to suit the different data model or schema for different NoSQL databases. The paper focus on the migration between document-based database and column-based database. The paper also discusses on the database schema of the target database that need to store and support the data that is with different schema.