SQLite with expo-sqlite in React Native - Build, Publish & Deploy

Build & Publish - SQLite with expo-sqlite

Performance Impact

Using expo-sqlite allows your app to store and query data locally on the device. This means faster data access compared to network calls, improving app responsiveness and offline capability.

However, heavy or complex queries can slow down the UI thread if not handled properly, causing frame drops below 60fps. SQLite operations are asynchronous by default, so large transactions may block the UI if not managed correctly.

Memory usage is generally low, but storing large blobs or many records can increase memory and storage use, potentially affecting app stability on low-end devices.

Battery impact is minimal for typical use, but frequent writes or queries can increase CPU usage and drain battery faster.

Optimization Tips

• Run queries asynchronously: Use transaction callbacks to avoid blocking the UI thread.
• Batch operations: Group multiple inserts or updates in a single transaction to reduce overhead.
• Index your tables: Create indexes on columns used in WHERE clauses to speed up queries.
• Limit data size: Avoid storing large blobs or unnecessary data in SQLite.
• Use pagination: Load data in small chunks instead of all at once to keep UI smooth.
• Close unused database connections: Prevent resource leaks.

App Bundle Size and Startup Time

expo-sqlite is included as part of the Expo SDK, so it adds minimal extra size to your app bundle.

Since SQLite is a native library, it does not increase JavaScript bundle size significantly.

Startup time impact is negligible because the database opens quickly and only when needed.

However, large local databases can increase app storage usage and slow down initial data loading if you preload data on startup.

iOS vs Android Differences

• Underlying SQLite: Both platforms use native SQLite, but Android may have different SQLite versions depending on OS version.
• File storage: Database files are stored in platform-specific app directories with different access permissions.
• Performance: Generally similar, but Android devices vary more in hardware, so performance can differ.
• Backup: iOS automatically backs up app data including SQLite files to iCloud unless excluded; Android backup behavior varies by device and settings.
• Concurrency: Android may handle concurrent database access differently; always use transactions to avoid conflicts.

Store Review Guidelines

• Data privacy: Ensure you handle user data securely and comply with privacy laws (e.g., GDPR, CCPA).
• Data storage: Do not store sensitive data unencrypted in SQLite; use encryption if required.
• App size: Keep database size reasonable to avoid app bloat.
• Performance: Avoid UI freezes caused by database operations to meet smoothness guidelines.
• Permissions: No special permissions are needed for SQLite, but if you export or share data, follow platform rules.

Self-Check Question

Your app takes 5 seconds to load this screen that queries SQLite. What is likely wrong?

• You might be running heavy or multiple synchronous queries on the main thread blocking UI rendering.
• You may be loading too much data at once instead of using pagination.
• Database indexes might be missing, causing slow queries.
• Transactions might not be batched, increasing overhead.

Key Result

Using expo-sqlite enables fast local data storage with minimal bundle size impact, but to keep your app smooth at 60fps, run queries asynchronously, batch operations, and limit data size. Be mindful of platform differences and store guidelines for data privacy and performance.