What is the real maximum batch size limit for external functions in Snowflake?

• A. 16 MB
• B. 10 MB
• C. 8 MB
• D. 32 MB

Answer: (B)

Understanding how much data you can send to an external function in a single call is key. Snowflake sets a hard limit on the payload size of a batch sent to the external function: 10 MB. This cap is in place to keep memory usage and latency predictable for both Snowflake and the external service. When your batch would exceed 10 MB once serialized (typically as JSON), you should split the data into smaller batches so each one stays under the limit. This constraint is why the other listed sizes aren’t the real maximum.