What is Redis persistence and how does it work?

What is Redis persistence and how does it work?

Redis persistence refers to the ability of Redis to save data to disk, ensuring that data is not lost when the server restarts. It primarily uses two mechanisms: RDB (Redis Database Backup) and AOF (Append Only File). RDB creates snapshots of your dataset at specified intervals, while AOF logs every write operation received by the server.

What are the advantages of using AOF over RDB?

AOF provides better durability since it logs every write operation, allowing for more frequent data recovery. However, it can be slower than RDB due to the overhead of logging every command. RDB is faster for backups but may result in data loss for operations that occur between snapshots.

Can I use both RDB and AOF together?

Yes, you can configure Redis to use both RDB and AOF. This setup allows you to benefit from the fast recovery of RDB and the durability of AOF, providing a balanced approach to data persistence.

How do I configure Redis for persistence?

You can configure Redis persistence in the redis.conf file. For RDB, you can set the save directive to specify the frequency of snapshots. For AOF, you can enable it by setting appendonly yes and configuring the appendfsync option to control how often data is written to disk.