SAFEGUARDING YOUR DATA

While Redis stores data in memory for ultra-fast access, it provides mechanisms to persist data to disk, allowing for data recovery and maintaining data integrity in the event of system failures or restarts.

Redis offers two main approaches to data persistence: snapshotting and append-only file (AOF) persistence.

Snapshotting, also known as RDB persistence, involves creating periodic snapshots of the data set and writing them to disk. These snapshots capture the state of the entire data set at a specific point in time, making it easy to restore Redis to a previous state in case of failures. Snapshotting is performed asynchronously to minimise the impact on the system’s performance. However, the data between two snapshots may be lost if a failure occurs before the next one.

AOF persistence logs every write operation to a file, creating an append-only log of commands that modify the data set. This log can be replayed to reconstruct the data set and recover data in case of failures. AOF persistence offers more granular recovery compared to snapshotting, as it captures every write operation. However, AOF persistence consumes more disk space and has a slight impact on write performance due to the continuous logging of commands.

Redis also provides different configurations for data persistence, enabling you to choose a level of persistence based on your needs. You can opt for a combination of snapshotting and AOF persistence, or choose a single method based on your desired trade-offs between performance, disk space usage and recovery capabilities.