In what cases is it recommended to use an architecture with a master and slave database for reading and writing data?

Architecture with separation of the database into master and slave for read and write operations is recommended in the following cases:

• High read load: when the number of read operations significantly exceeds write operations, slaves help distribute the load.
• Scalability: allows horizontal scaling of reads by adding slave servers.
• Increased fault tolerance: in case of master failure, slaves can be used for data recovery.
• Separation of responsibilities: the master handles data writing and updating, while slaves handle reading, which simplifies optimization and monitoring.

However, it is important to consider the replication delay between the master and slaves, which can lead to temporary data inconsistency during reads.

Example of use: in a web application where users often view data (reading), but updates occur less frequently (writing), the master processes all changes, and slaves handle read requests, reducing the load on the main server.