DAX: When Microsecond Reads Actually Matter
~10 min read
What DAX caches, its consistency limitation, and the specific workload shapes where it earns its cost.
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Key points
- •DAX caches both GetItem and Query/Scan results, requiring only an SDK client swap
- •Only eventually consistent reads benefit — strongly consistent reads always bypass the cache
- •Best suited for extremely hot, read-heavy, small key sets (leaderboards, flash-sale pages)
- •Writes go through DAX to the table, keeping cache and table from diverging significantly over time