Realm Database Mobile

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Realm is an embedded mobile database (iOS, Android, React Native) that stores data locally and syncs to MongoDB Cloud. Mobile developers use it for offline-first apps, fast queries, and automatic cloud sync. Learning time: 3–4 months. Salary impact: High; offline-first is critical for mobile. Adjacent: React Native, Mobile Development, MongoDB, SQLite.

Realm Database Mobile이란

Realm is an embedded mobile database for iOS, Android, and React Native that prioritizes offline-first functionality and cloud sync. Unlike REST APIs that require network connectivity, Realm stores data locally on the device and synchronizes to MongoDB Cloud asynchronously. Apps read and write to the local database instantly, giving users a fast, responsive experience whether online or offline. Realm is object-oriented: you define data models in code, and Realm handles persistence, indexing, and ACID transactions automatically. When you enable Realm Sync, changes sync bi-directionally with MongoDB Cloud.

🔧 도구 & 생태계

Realm DatabaseRealm StudioMongoDB Cloud SyncReact Native RealmXcode iOSAndroid StudioRealm Query LanguageMobile Studio

📋 시작하기 전에

React Native Development

💰 지역별 연봉

지역	주니어	미들	시니어
USA	$85k	$140k	$200k
UK	$50k	$85k	$130k
EU	$55k	$90k	$135k
CANADA	$80k	$135k	$195k

🎓 자격증

MongoDB Realm Documentation Realm JavaScript SDK

🎯 Realm Database Mobile을(를) 활용하는 직무

Mobile Game Developer Indie

❓ 자주 묻는 질문

Why Realm over SQLite?

Realm is object-oriented (no ORM boilerplate), faster queries, and has built-in cloud sync. SQLite requires manual sync logic. Realm is better for modern mobile.

Does Realm work offline?

Yes, that's its strength. All data is stored locally. When network returns, Realm syncs with MongoDB Cloud automatically (if configured).

What happens if the device is offline for a week?

Data stays on device and syncs when connected. Realm handles merge conflicts via custom resolution functions or default strategies (last-write-wins).

Can multiple users collaborate?

Yes, via Realm Sync. Users sync to the same MongoDB collection. Realm detects changes and merges them (with conflict resolution).

Is Realm free?

Realm database is open-source and free. MongoDB Cloud Sync has a free tier (up to 100MB data). Larger apps pay per-GB.

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