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
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
dragonfly> SAVE
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 preferBGSAVE
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.