SAVE

Introduction and Use Case(s)

The SAVE command in Redis is used to synchronously save the dataset to disk. This command is particularly useful in scenarios where you need to ensure that all changes to your dataset are persisted immediately, such as before a planned maintenance window or shutdown.

Syntax

  1. SAVE

Parameter Explanations

The SAVE command does not take any parameters. It simply forces a synchronous save of the dataset.

Return Values

  • OK: If the save operation was successful.
  • Error: If the save operation failed for some reason (e.g., during an ongoing save).

Code Examples

  1. dragonfly> SAVE
  2. OK

Best Practices

  • Use SAVE sparingly in production environments because it blocks the server until the save operation completes, which can affect performance and availability.
  • For regular backups, consider using BGSAVE, which performs the save operation in the background without blocking.

Common Mistakes

  • Using SAVE in a high-load production environment can lead to significant latency due to its blocking nature. Always prefer BGSAVE unless absolutely necessary.
  • Assuming SAVE guarantees no data loss; while it does persist data immediately, unexpected failures right after the save could still pose risks.

FAQs

What is the difference between SAVE and BGSAVE?

SAVE performs a synchronous save and blocks the Redis server until the operation completes. BGSAVE performs the save in the background, allowing the server to continue processing other commands.

Can I use SAVE in a script?

Yes, but be aware that it will block the entire Redis server during the execution, potentially causing high latency for other operations.