> It would be interesting to see a list of features from major database management systems that have been removed over the years. The only other thing I can th

> It would be interesting to see a list of features from major database management systems that have been removed over the years. The only other thing I can think of right now are in-memory optimized indexes (e.g., T-Trees) from the 1980s. These were later removed and replaced with B+trees (or skip lists if you're MemSQL) because CPU caches (SRAM) got much faster than memory (DRAM).