It depends on what the use case is and tradeoffs with budget, space and time. For real-time reporting and analytics, we've gone with in-memory databases. Howe

It depends on what the use case is and tradeoffs with budget, space and time. For real-time reporting and analytics, we've gone with in-memory databases. However, for more detailed analytics, we work with Hadoop and we also build our own data warehouse to summarize transactional data.