What happens after SAVE?

After executing the SAVE command in Redis, the following occurs:

1. Snapshot Creation: Redis creates a snapshot of the current database state and saves it to disk. This snapshot is typically stored in a file named dump.rdb in the Redis working directory.

2. Blocking Behavior: The SAVE command blocks the Redis server, meaning it cannot process any other commands until the save operation is complete. This ensures data consistency during the snapshot process.

3. Output Confirmation: Once the save operation is successfully completed, Redis returns an OK response, indicating that the snapshot has been created and saved.

4. Data Durability: The data saved to disk can be used for recovery in case of a server restart or failure, ensuring that the data is not lost.

5. No Impact on Current Operations: While the server is blocked during the save operation, any commands issued by clients will be queued and processed once the save is complete.

Overall, the SAVE command is a crucial operation for ensuring data persistence in Redis.