This topic describes the functional architecture of OceanBase Migration Service (OMS).
Service access layer
The service access layer manages migration projects and various data sources, and implements the O&M, monitoring, and alerts of all OMS components.
Process orchestration layer
The process orchestration layer manages the details for performing tasks such as upper-layer schema migration, full data migration or synchronization, incremental data migration or synchronization, data verification, data correction, and link switching.
Component link layer
The component link layer contains the following components:
DBCat: accurately maps or converts data based on the source data type, destination data type, and character encoding type. The DBCat component is the native schema conversion engine of OceanBase Database and is the core schema migration component of OMS.
The DBCat component can convert and migrate various database objects such as tables, constraints, indexes, and views.
Checker: migrates and verifies full data, and generates correction SQL scripts for inconsistent data.
Store: reads, parses, and stores incremental logs of the database.
JDBCWriter: concurrently writes data to the destination database.
Connector: writes full data and incremental data to the destination message queue and relational database.
Supervisor: monitors the component status.