SQLite WAL Mode and Connection Strategies for High-Throughput Mobile Apps: Beyond the Basics

--- title: "SQLite WAL Mode for High-Throughput Mobile: A Hands-On Guide to Eliminating SQLITE_BUSY" published: true description: "Build a properly pooled SQLite configuration using WAL and WAL2 modes with Room and SQLDelight. Includes benchmarks, connection strategies, and the pragmas that actually matter." tags: kotlin, android, ios, architecture canonical_url: https://blog.mvpfactory.co/sqlite-wal-mode-high-throughput-mobile --- ## What We Will Build By the end of this tutorial, you will have a SQLite configuration that handles concurrent reads and writes without `SQLITE_BUSY` errors. We will walk through WAL mode setup in both Room (Android) and SQLDelight (KMP), implement proper connection pooling with separated read/write dispatchers, and I will show you when WAL2 with `BEGIN CONCURRENT` is worth the custom build effort — backed by real benchmarks on Pixel 8 and iPhone 15 Pro. ## Prerequisites - Familiarity with Room or SQLDelight - A project targeting Android 8+ or iOS 15