SQLite improving performance with pre-sort
a month ago
- UUID4's randomness slows down insert speeds, similar to random data like 20-byte session tokens, due to B+ Tree page thrashing.
- Presorting random data before insertion improves SQLite performance by 2-3x by leveraging sequential writes.
- A custom byte comparison function converts first 8 bytes of BLOBs to unsigned longs for fast sorting, matching SQLite's memcmp().
- Batching data allows optimizations like presorting, making it useful for unordered data in performance-critical scenarios.