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RedisAdriano Amaral5 min readintermediate

Search on Flex comes to Redis Cloud Pro: same Search API, a fraction of the RAM

Summary

Redis Cloud Pro now offers Search on Flex, allowing Redis Search indexes to reside on tiered RAM/SSD storage and reducing RAM usage to about 10% of a pure in‑memory index. The feature uses the same Search API, adds Query Performance Factor for throughput, and targets terabyte‑scale workloads without code changes.

  • Search indexes can be stored on Redis Flex tiered storage, cutting RAM usage to roughly 10% of an equivalent in‑memory index.
  • The same Redis Search API (FT.CREATE, FT.SEARCH, etc.) works unchanged; no code modifications are needed.
  • Query Performance Factor spreads query execution across vCPUs, targeting ~10× in‑memory latency at 10% RAM footprint.
  • Preview supports HASH, TEXT, TAG, and VECTOR (HNSW/FLAT) fields; other field types will be added later.

Engineers building large‑scale search or retrieval workloads on Redis can now stay on a single platform and cut costs without rewriting their queries.

5/10

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