Vector Database
Industry Definition Set • Entity Resolution Path: /glossary/vector-database
Quick Answer / TL;DR
A specialized database optimized for storing and querying high-dimensional embedding vectors, enabling fast semantic similarity search at scale.
Key Takeaways
- Optimized for high-dimensional vector storage and ANN search.
- Core component of RAG and semantic search systems.
- Can be self-hosted (Qdrant, Weaviate) or managed (Pinecone).
- Supports metadata filtering alongside vector similarity.
Definitive Statement: A specialized database optimized for storing and querying high-dimensional embedding vectors, enabling fast semantic similarity search at scale.
Technical Context & Protocol Usage
- Detailed Explanation
- Vector databases like Pinecone, Weaviate, Qdrant, and Milvus store embeddings alongside metadata and support approximate nearest neighbor (ANN) search. They are the storage backbone of RAG systems, allowing agents to retrieve relevant documents by semantic similarity. MCP servers can expose vector databases as tools for storing and querying agent memory.
Format & Payload Metadata
Format: HNSW, IVF, or other ANN indexes on dense vectors
Latency: Sub-second for typical collection sizes
Real-World Implementation Use Case
An agent uses an MCP server backed by Qdrant to store conversation summaries and retrieve relevant past context by semantic similarity.
Cite This Page
MLA Style:
MCPserver.in Engineering. "Vector Database." MCPserver.in Knowledge Hub, 20 July 2026, mcpserver.in/glossary/vector-database.
Related Terms
Model Context Protocol (MCP)
An open, secure protocol that standardizes how artificial intelligence agents and large language models (LLMs) exchange context, tools, prompts, and data resources with external servers.
JSON-RPC 2.0
A lightweight, stateless remote procedure call (RPC) protocol defined in JSON that utilizes request, response, and notification message frames.
Stdio Transport (Standard Input/Output)
A local-only transport mechanism where the AI client spawns the MCP server as a child process and communicates via standard input (stdin) and standard output (stdout) channels.
SSE Transport (Server-Sent Events)
A lightweight, unidirectional HTTP-based streaming protocol used by remote MCP servers to push messages to AI clients, with client-to-server writes sent over standard POST requests.
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