Glossary
Every term the courses use, defined in one line and then in a paragraph. Written to be read out of order.
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A question asked of the database.
A request for data. Cheap when an index supports it, ruinous when it forces a scan of every row. Which questions you ask should be a design decision, not an accident.
See also Index, N+1, Full table scan
A durable list of work waiting to be done.
Holds jobs until a worker picks them up, absorbing spikes by delaying work rather than dropping it. Survives crashes, and normally guarantees at-least-once delivery.
See also Worker, At-least-once, Dead letter queue