What are the different persistence mechanisms in Redis?

There are two types of persistence mechanisms in Redis: RDB persistence and AOF persistence.

1. RDB Persistence: RDB persistence achieves persistence by writing the dataset to disk at specified time intervals. When RDB persistence is enabled, Redis generates snapshot files based on specified conditions, saving all key-value pairs in the current database. The frequency and file name for saving snapshot files can be configured in the settings file.
2. AOF Persistence: AOF persistence is achieved by recording all write commands. When AOF persistence is enabled, Redis appends each write operation to the end of the AOF file, ensuring data persistence. The AOF file contains a log of all write operations, and data can be restored by replaying the commands in the AOF file.

In practical applications, you can choose to use RDB persistence, AOF persistence, or a combination of both to ensure the persistence and reliability of data.