A practical concurrent index for solid-state drives

Solid-state drives are becoming a viable alternative to magnetic disks in database systems, but their performance characteristics, particularly those caused by their erase-before-write behavior, make conventional database indexes a poor fit. There have been various proposals of indexes specialized for these devices, but to make such indexes practical, we must address the issue of concurrency control. Good concurrency control is especially critical to indexes on solid-state drives, because they typically rely on batch updates, which may take long and block concurrent index accesses. We design, implement, and evaluate an index structure called FD+tree and an associated concurrency control scheme called FD+FC. Our evaluation confirms significant performance advantages of our approach over less sophisticated ones, and brings ou insights on data structure design and OLTP performance tuning on solid-state drives.