What are the different techniques for database synchronization?

What are the different techniques for database synchronization?

There are several techniques for database synchronization, including:

1. Master-Slave Replication: One master database is updated, and changes are replicated to slave databases.
2. Multi-Master Replication: Multiple databases can act as masters, allowing updates from any of them.
3. Log Shipping: Transaction logs are shipped from one database to another to keep them in sync.
4. Change Data Capture (CDC): Captures changes in the database and applies them to another database.
5. Data Integration Tools: Use ETL (Extract, Transform, Load) processes to synchronize data between databases.

Can you explain how Master-Slave Replication works?

Sure! In Master-Slave Replication, one database acts as the master, where all write operations occur. The slave databases replicate the master's data, usually in real-time or near real-time. This setup helps in load balancing and provides redundancy, as the slaves can take over if the master fails.

What are the advantages of using Multi-Master Replication?

Multi-Master Replication allows multiple databases to accept write operations, which can improve availability and performance. It also provides redundancy, as any master can take over if another fails. However, it requires conflict resolution mechanisms to handle simultaneous updates.

Are there any challenges with Change Data Capture?

Yes, while Change Data Capture (CDC) is efficient, it can introduce complexity in tracking changes, especially in high-transaction environments. Additionally, ensuring data consistency and managing the overhead of capturing changes can be challenging.