Primary database

The primary database is used to add, update, and delete data operations. Currently, only single primary database is supported.

Secondary database

The secondary database is used to query data operations and multi-secondary databases are supported.

Primary-Secondary synchronization

It refers to the operation of asynchronously synchronizing data from a primary database to a secondary database. Due to the asynchronism of primary-secondary synchronization, data from the primary and secondary databases may be inconsistent for a short time.

Load balancer policy

Channel query requests to different secondary databases through load balancer policy.