In a bidirectional synchronization topology, the data transfer service typically focuses on synchronizing data changes, such as inserts, updates, and deletes, between two or more systems. DDL (Data Definition Language) operations, which involve altering the structure of the database, such as creating, altering, or dropping tables and columns, are generally more complex to synchronize bidirectionally.
Bidirectional synchronization of DDL can lead to conflicts and inconsistencies if not managed carefully. For example, if two databases are synchronized in both directions and one database adds a new column while the other removes it, the synchronization process would need to resolve this conflict, which can be non-trivial.
To handle DDL operations in a bidirectional synchronization scenario, specialized tools or services are often required that can manage conflicts and ensure consistency. These tools typically have mechanisms to detect DDL changes, resolve conflicts, and apply the changes in a controlled manner.
For instance, in a cloud environment, a service like Tencent Cloud's Data Transmission Service (DTS) can be used to facilitate data synchronization. While DTS primarily focuses on data changes, it can be configured to handle DDL operations with careful planning and conflict resolution strategies. This might involve setting up rules for DDL operations, using timestamps or versioning to detect changes, and implementing custom logic to resolve conflicts when they arise.
In summary, while bidirectional synchronization of DDL is technically feasible with the right tools and strategies, it requires careful management to avoid conflicts and ensure data consistency.