Database / ValKey Interview questions

How do you use Valkey Streams for event processing?

Streams model an append-only log of time-ordered entries, each with an auto-generated or explicit ID, which makes them a natural fit for event pipelines.

XADD orders * order_id 1042 status "created"
XGROUP CREATE orders workers $
XREADGROUP GROUP workers consumer1 COUNT 5 STREAMS orders >
XACK orders workers 1699999999999-0

Consumer groups let multiple worker processes share the load of a single stream, with each entry delivered to exactly one consumer in the group; a pending-entries list tracks unacknowledged messages, and XCLAIM/XAUTOCLAIM can reassign entries a stalled consumer never acknowledged.

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Consumer groups in Streams allow multiple consumers to... each receive every message independently, like pub/sub

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share the workload of a stream, with each entry delivered to only one consumer in the group

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permanently delete the stream

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disable persistence

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XACK is used to... add a new entry to the stream

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acknowledge that a consumer has finished processing a stream entry

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create a consumer group

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delete the entire stream

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Database / ValKey Interview questions

How do you use Valkey Streams for event processing?

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