Redis®*: Good to know

This documentation is part of the Search and JSON guide. You can view the complete guide here: Store JSON documents and query them efficiently with the Redis query engine.

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• Search indexes only work on database 0. FT.CREATE returns an error on any other database. If your application uses several logical databases, keep indexable data on database 0, or use key prefixes to separate your datasets.
• Indexes use your plan's memory, just like your data. Large text or vector indexes can be significant, so monitor used_memory in your Prometheus metrics after building them.
• Building an index on existing keys runs in the background. Immediately after FT.CREATE, searches may briefly return incomplete results. You can monitor the indexing progress with FT.INFO productsIndex.
• All module commands are fully available. Every command of every enabled module is ready to use in your service.

To learn more about vector similarity, semantic search, or retrieval-augmented generation, see the vector search guide.