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###### tags: `第13屆IT邦鐵人賽文章` # 【在 iOS 開發路上的大小事-Day24】Firebase 的兩個資料庫介紹 Firebase 提供了兩種資料庫供我們做使用,分別是 Realtime Database、Cloud Firestore Database 這兩種都有不同的用途跟用法,下面就來簡單介紹一下 # Realtime Database 介紹 Firebase Realtime Database 是一個雲端資料庫 資料會用 JSON 格式儲存並即時同步到每個用戶端 也就是說不管是用 Android、iOS 還是用 JavaScript SDK 開發跨平台應用時 所有的用戶端都可以共享同一個 Realtime Database,並自動接收包含最新資料的更新 ![](https://i.imgur.com/6Z189E8.png) ▲ Realtime Database 資料儲存結構 # Cloud Firestore Database 介紹 Firebase Cloud Firestore 是一種靈活且可擴縮的資料庫 適用於在 Firebase 和 Google Cloud Platform 上進行行動、Web 和服務器應用開發 與 Realtime Database 一樣,都可以透過實時偵聽器使資料在各個用戶端之間保持同步一致 ![](https://i.imgur.com/Tm2y3hT.png) ▲ Cloud Firestore Database 資料儲存結構 # 兩種資料庫比較 | | Realtime Database | Cloud Firestore Database | |:--------------------------------:|:--------------------------------:|:-----------------------------------------------------:| | 使用目的 | 基本查詢同步資料 | 高級查詢、排序和事務 | | 資料結構 | 簡單的 JSON 樹 | 文檔整理為集合 | | 資料庫用量 | 經常發生更改的幾 GB 或更少的資料 | 大小為數百 GB 到 TB,且讀取頻率比更改頻率高得多的資料 | | 可用性需求 | 保證正常運行時間至少達到 99.95% | 99.999% 的極高正常運行時間保證 | | 資料庫實例數 | 一個或許多 | 一個 | | 在無法連接的設備上執行查詢的頻率 | 極少或從不 | 頻繁、極少或從不 | # 總結 看完上述說明後,應該對這兩種資料庫有初步的認識了 後面會用實例來實作 Realtime Database、Cloud Firestore Database 這兩種資料庫 參考資料: 1. [Firebase Realtime Database 官方文件](https://firebase.google.com/docs/database) 2. [Firebase Cloud Firestore Database 官方文件](https://firebase.google.com/docs/firestore)

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