Beyond the SQLite Single-Writer Limitation with Concurrent Writes
7 days ago
- #Database
- #Concurrency
- #SQLite
- Turso Beta introduces concurrent writes to SQLite, addressing the single-writer model limitation.
- SQLite's single-writer model causes SQLITE_BUSY errors and underutilizes multi-core processors.
- Turso's MVCC (Multi-Version Concurrency Control) allows multiple transactions to proceed simultaneously, improving write throughput by up to 4x.
- MVCC detects row-level conflicts at commit time, unlike SQLite's page-level conflict detection.
- Turso's implementation is inspired by the Hekaton system, using an in-memory index for row versions.
- Benchmarks show Turso outperforms SQLite in multi-threaded scenarios, especially with compute-heavy transactions.
- Use cases benefiting from concurrent writes include e-commerce transactions, high-volume data ingestion, and stream processing.
- Current limitations of Turso's MVCC include inefficient row version storage and lack of asynchronous I/O support.
- Future optimizations aim to improve memory efficiency, scalability, and performance through techniques like io_uring.