Redis restart does not clear the data because Redis stores the data in memory and loads the data from persistent storage such as RDB or AOF. There are two types of persistent storage: RDB and AOF, which ensure that data is not lost after restarting. In addition, Redis has other protections such as snapshot options, replication and sentinels to prevent data loss. However, in rare cases, such as persistent storage corruption or accidental termination, it can lead to data loss.
Will Redis restart clear data?
No, Redis restart will not clear data.
Redis is an in-memory database that stores data in memory. When Redis restarts, it will load data from persistent storage such as RDB or AOF and continue to run without losing any data.
Persistent storage type
Redis has two persistent storage types:
- RDB (Redis Database): Periodically dumps the entire dataset to disk files.
- AOF (append-only file): Append each write operation to the log file.
Both persistence options ensure that data is not lost after Redis restart.
Data protection measures
In addition to persistent storage, Redis has other protections to prevent data loss:
- Snapshot Options: Snapshot frequency can be optionally disabled or configured to reduce the performance impact of persistent operations.
- Replication: Redis can be configured as master-slave replication, where the master node replicates data to the slave node, providing redundancy and failover capabilities.
- Sentinel: The Sentinel process monitors the status of the Redis instance and automatically performs failover in the event of a failure.
Exceptions
In rare cases, Redis restarts may result in data loss:
- Persistent storage corrupted: If the RDB or AOF file is corrupted, the data will not be recovered.
- Unexpected Termination: If the Redis process terminates unexpectedly during a persistence operation, data that has not yet been persisted may be lost.
To minimize the risk of data loss, it is recommended to back up Redis data regularly and take appropriate precautions, such as the use of replication and sentinels.
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