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Target customers: all developers. Features released: The Retrieval-Augmented Generation (RAG) service of AnalyticDB for PostgreSQL is an innovative AI service. The RAG service integrates retrieval and generation technologies to provide search experience in a more accurate, flexible, and cost-efficient manner. The RAG service uses data processing and semantic search to generate contextual and informative answers or content. The RAG service is widely used in a variety of fields, such as intelligent customer service, content creation, and knowledge management. The RAG service of AnalyticDB for PostgreSQL provides advanced hybrid search capabilities and consists of three modules: augmented data processing, augmented semantic search, and augmented retrieval. The augmented data processing module provides in-depth pre-understanding of multimodal data to ensure high-quality data splitting and vector conversion. The augmented semantic search module uses advanced semantic understanding technologies to perform in-depth analysis of user requirements and retrieve the most relevant information from the preprocessed data in a fast and accurate manner. The augmented retrieval module uses fine-grained ranking and filtering algorithms to improve the relevance and diversity of search results and provide more informative and accurate answers for subsequent generation steps. The well-designed process contributes to the powerful content generation capabilities of the RAG service and ensures high quality and high matching of generated content.