{"version":"1.0","generated_at":"2026-09-27T14:59:40.871356","id":2495,"slug":"alloydb-scann-100","title":"AlloyDB ScaNN 如何将向量搜索扩展到 100 亿向量","summary":"AlloyDB 推出 ScaNN 索引四层树架构，支持超 100 亿向量规模，查询延迟低至 51ms，召回率 95%。","abstract":"AlloyDB ScaNN 如何将向量搜索扩展到 100 亿向量 AlloyDB 推出 ScaNN 索引四层树架构，支持超 100 亿向量规模，查询延迟低至 51ms，召回率 95%。 AlloyDB 推出 ScaNN 索引四层树架构，支持超 100 亿向量规模，查询延迟低至 51ms，召回率 95%。 原贴提到：AlloyDB 的 ScaNN 索引现已支持超过 100 亿向量的规模，通过全新的四层树架构（预览版）实现，将查询复杂度从 O（N^1/2） 降 来源：cloud.google.com AlloyDB 的 ScaNN 索引现已支持超过 100 亿向量的规模，通过全新的四层树架构（预览版）实现，将查询复杂度从 O（N^1/2） 降至 O（N^1/4）。内部测试中，该架构在 100 亿向量规模下可实现 p95 延迟不超过 51 毫秒、召回率达 95%。该功能可通过快速入门指南部署，新用户可享受 30 天免费试用。 这是什么信号 AlloyDB 作为 Google Cloud 的托管数据库服务，其 ScaNN 索引更新意味着向量搜索能力的大幅跃升。ScaNN 原本是 Google 内部用于检索的算法，现在集成到数据库产品中，并针对大规模向量进行了架构级优化。四层树结构将查询复杂度从平方根降至四次方根，这是一个显著的算法改进。 为什么重要 在大模型时代，向量检索是 RAG、推荐系统、语义搜索等应用的核心。支持 100 亿向量规模意味着企业可以直接在数据库中处理海量向量数据，而无需额外的专用向量数据库。这降低了架构复杂性和运维成本，同时也提升了性能。低延迟和高召回率使得实时…","access_level":"member","access_label":"免费阅读","access_mode":"full","is_preview":false,"canonical_url":"https://opc.beizhux.com/content/2495/alloydb-scann-100","html_url":"https://opc.beizhux.com/content/2495/alloydb-scann-100","json_url":"https://opc.beizhux.com/content/2495/alloydb-scann-100.json","published_at":"2026-08-21T00:00:00","updated_at":"2026-09-27T14:07:35","category":{"slug":"ai-business","name":"AI小生意项目库"},"source":{"site":"cloud.google.com","author":"Google Cloud：Databases（RSS）","url":"https://cloud.google.com/blog/products/databases/alloydb-scann-index-four-level-tree-improves-vector-search"},"tags":["AI","AIHOT 精选","AI基础设施","AlloyDB","Google 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