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This document shows you how to use stored embeddings to generate indexes and query
embeddings. For more information about storing embedding, see
Store vector embeddings.
You can create ScaNN, IVF, IVFFlat, and HNSW indexes with AlloyDB.
Before you begin
Before you can start creating indexes, you must complete the following
prerequisites.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-25 UTC."],[[["This guide outlines how to generate and query indexes using stored embeddings within AlloyDB."],["AlloyDB supports the creation of `ScaNN`, `IVF`, `IVFFlat`, and `HNSW` index types for efficient data retrieval."],["Prior to index creation, ensure that embedding vectors are stored in a table, the `vector` extension (version 0.5.0 or later) is installed, and, for `ScaNN` indexes, the `alloydb_scann` extension is installed."],["When upgrading to AlloyDB Omni, drop any indexes created with the `postgres_ann` extension and recreate them using `alloydb_scann`."]]],[]]