Database / Supabase Intermediate to Advanced Interview Questions

What is the difference between resumable (TUS) uploads and standard uploads in Supabase Storage?

A standard upload sends the entire file in one HTTP request; if the connection drops partway through, the whole upload has to restart from byte zero. A resumable upload, using the open TUS protocol, breaks the file into chunks and tracks how much has already been received, so an interrupted upload can continue from where it left off instead of restarting.

Standard Upload	Resumable (TUS) Upload
Single request, restarts fully on failure	Chunked, resumes from last successful byte
Simpler for small files	Better for large files on unreliable networks

TUS is the better choice for large files (videos, large datasets) or mobile clients on unreliable networks, where restarting a multi-gigabyte upload from scratch after a dropped connection would be costly.

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What protocol does Supabase use for resumable uploads? gRPC

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FTP

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TUS

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WebRTC

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What happens to a standard (non-resumable) upload if the connection drops partway through? It must restart from byte zero

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The file is saved as corrupted but usable

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Supabase automatically retries via TUS

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It automatically resumes from the last chunk

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More Related questions...

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