TiDB and MyScale are two vector databases designed to store and query high-dimensional vectors, which encode complex information such as semantic meaning of text or product attributes. TiDB is a MySQL-compatible distributed SQL database that offers hybrid transactional and analytical processing capabilities, while MyScale is a cloud-based database built on top of ClickHouse, focusing on time series, vector search, and full-text search. Both databases offer native vector search capabilities with multiple index types and similarity metrics. TiDB integrates vector search through external libraries, whereas MyScale has native vector search implementation with proprietary MSTG vector engine using NVMe SSDs for improved data density and performance. TiDB is suitable for enterprise-grade distributed SQL with vector search capabilities, while MyScale stands out with its dedicated vector search and analytics with comprehensive LLM system monitoring. To evaluate these databases, users can use the open-source VectorDBBench tool, which allows them to test and compare different vector database systems using their own datasets.