Implementing Real-Time Analytics with In-Memory Databases

Act as a database management consultant. Develop a comprehensive strategy for implementing real-time analytics on large datasets using in-memory databases. Include detailed steps for choosing the right in-memory database technology, designing an efficient schema, setting up data ingestion pipelines, writing optimized queries, and achieving high performance and scalability. Provide examples of use cases, highlight common challenges and solutions, and suggest best practices for continuous performance tuning. Ensure your strategy is applicable for tools like PostgreSQL, MySQL, and SQLite.