MySQL Read-Write Separation Methods

MySQL read-write separation is achieved by assigning read and write operations to different MySQL instances.

There are two common implementation methods:

1. Implementing read-write separation through MySQL proxy server.
2. Configure a read-write separation rule on the MySQL proxy server to route read and write operations to different MySQL instances based on the type of SQL statement.
3. Read operations can be distributed to multiple read-only MySQL instances through a load balancing algorithm to improve read performance.
4. Write operations are only forwarded to the master MySQL instance to ensure data consistency.
5. Commonly used MySQL proxy servers include MySQL Proxy and MaxScale.
6. Implementing read-write separation using application layer code.
7. Manually switching database connections in application layer code based on the type of SQL statement.
8. For read operations, connecting to a read-only MySQL instance allows for evenly distributing read requests through a load balancing algorithm.
9. When performing write operations, ensure data consistency by using the connection to the primary MySQL instance.
10. This method requires explicit management of database connections in the application layer, which can be cumbersome but offers greater flexibility.

Regardless of the method used to achieve MySQL read/write separation, the following points need to be considered:

1. Database master-slave synchronization: Write operations on the master database need to be synchronized with the slave database to ensure data consistency.
2. Database connection management: it involves managing the creation, shutdown, and usage of connection pools in order to improve performance and resource utilization.
3. The logic of database switching involves determining when to use a read or write database based on business needs, and how to handle potential data inconsistencies when switching between reading and writing.