TiDB and Vald are two powerful vector databases designed to store and query high-dimensional vectors, enabling efficient similarity searches in AI applications. TiDB is a traditional database with vector search as an add-on, offering hybrid transactional and analytical processing capabilities and MySQL compatibility. It provides flexibility for combining vector search with relational queries, making it suitable for complex applications requiring both vector similarity and SQL-driven analytics. On the other hand, Vald is a dedicated vector database built to handle massive vector datasets, utilizing a super quick algorithm called NGT to find similar vectors. Its indexing and search capabilities remain performant as data grows, making it an excellent choice for high-scale vector search scenarios. When choosing between TiDB and Vald, consider the use case: if hybrid data management is required with vector search, TiDB's HTAP architecture might be more suitable; otherwise, Vald's specialized architecture and dynamic scaling make it a better fit for applications focused on similarity search across big datasets. Thorough benchmarking with actual datasets and query patterns will ultimately determine the best tool for your specific needs.