SQLite WAL Mode, Connection Pooling, and Room's Query Planner

--- title : " SQLite WAL Mode and Room Query Optimization for Mobile" published : true description : " A hands-on guide to SQLite WAL vs DELETE journal modes, Room InvalidationTracker pitfalls, connection pooling, and index strategies that keep offline-first Android apps under 16ms frame budgets." tags : android, kotlin, architecture, performance canonical_url : https://blog.mvpfactory.co/sqlite-wal-mode-room-query-optimization-mobile --- ## What You Will Build By the end of this tutorial, you will have a concrete playbook for making your Room-backed Android database perform under real offline-first pressure. We will walk through WAL mode configuration, connection pool sizing, taming Room's InvalidationTracker, and the exact index patterns that keep sync operations under the 16ms frame budget. Let me show you a pattern I use in every project. ## Prerequisites - An Android project using Room (AndroidX) - Basic familiarity with SQLite and Kotlin coroutines - A table with at least 10K+ ro