The standalone architecture of ApsaraDB for MongoDB is a supplement to the replica set architecture and sharded cluster architecture. A standalone instance applies to development, testing, and other scenarios where non-core enterprise data is stored. It enables you to purchase ApsaraDB for MongoDB at a lower entry-level price to enjoy its superiority in O&M support and kernel-level optimization. The standalone architecture can adapt ApsaraDB for MongoDB to various scenarios to help enterprises minimize their costs and expenses.