Function setPersistenceCacheSizeBytes

By default, Firebase Database will use up to 10MB of disk space to cache data. If the cache grows beyond this size, Firebase Database will start removing data that hasn't been recently used. If you find that your application caches too little or too much data, call this method to change the cache size. This method must be called before creating your first Database reference and only needs to be called once per application.

Note that the specified cache size is only an approximation and the size on disk may temporarily exceed it at times. Cache sizes smaller than 1 MB or greater than 100 MB are not supported.

Example

const db = getDatabase();

setPersistenceEnabled(db, true);
setPersistenceCacheSizeBytes(db, 2000000); // 2MB

async function bootstrap() {
  // Bootstrapping application
  const snapshot = await ref(db, 'settings').once("value");
}
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