Cost Optimized Vector Database: Introduction to Amazon OpenSearch Service quantization techniques

This article explores vector database optimization techniques in Amazon OpenSearch Service, focusing on quantization methods to reduce memory usage and operational costs for generative AI applications.

• Four primary quantization techniques are introduced:
  • Binary quantization (up to 32x compression)
  • Byte quantization (4x compression)
  • FP16 quantization (2x compression)
  • Product quantization (up to 64x compression)
• Disk-based vector search enables efficient querying by:
  • Storing full-precision vectors on disk
  • Using compressed vectors in memory
  • Supporting multiple compression levels
• Performance comparison shows significant cost savings:
  • Product quantization: Up to 90% cost reduction
  • Scalar quantization: 50-85% cost savings
  • Minimal impact on recall and query latency

The article recommends evaluating different quantization techniques based on specific use case requirements, balancing cost, performance, and accuracy.