How to Perform Large Deletes in the Realtime Database

Firebase Realtime Database introduced improved support for large-scale data deletion through Firebase CLI version 6.4.0 and later, which detects large nodes and removes them in chunks to reduce capacity strain. Because chunked deletion can temporarily expose partially deleted data and does not block new writes at the affected path, applications with active listeners may need to handle incomplete states; systems requiring immediate consistency can instead use tombstone fields to hide records before asynchronously purging them with scheduled Cloud Functions and access rules. The update also adds the defaultWriteSizeLimit configuration, which prevents oversized writes or deletes based on estimated execution times, with small, medium, large, and unlimited thresholds, plus a REST-only tiny option. New databases default to the large threshold, while existing databases initially retain unlimited limits, though Firebase planned to shift eligible existing databases to large during summer 2019 and encouraged developers to configure protections proactively.

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