Database / ValKey Interview questions

When should you choose Valkey Cluster over Sentinel?

Cluster mode becomes necessary once the working set or the required write throughput outgrows what a single primary node can hold or handle, since it is the mechanism that actually shards data across many machines.

Sentinel is often the better fit when the dataset comfortably fits on one primary and the main requirement is automatic failover, since it avoids the constraints Cluster places on multi-key commands and Lua scripts, which must operate on keys mapped to the same hash slot unless hash tags are used.

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Cluster mode becomes necessary primarily when... you only need failover with no sharding

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the working set or write throughput exceeds what a single primary can hold or handle

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you want to disable persistence

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you need a single-node deployment

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Sentinel is often simpler to operate than Cluster because... it eliminates the need for replicas

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it doesn't require partitioning the keyspace or using hash tags for multi-key commands

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it removes the need for any monitoring

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it doesn't support failover

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Database / ValKey Interview questions

When should you choose Valkey Cluster over Sentinel?

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