What causes SYNAPSE_SQL_0012?

Wide tables with many VARCHAR columns storing large strings. Multiple large NVARCHAR columns that are not sparsed. Denormalized table design with excessive column count

How do I fix SYNAPSE_SQL_0012?

Step 1: Identify which columns contribute most to row size.. Step 2: Move large VARCHAR/NVARCHAR columns to a separate wide-column table and JOIN as needed.. Step 3: Use MAX types (VARCHAR(MAX)) — Synapse stores these off-row.. Step 4: Consider compressing large text data before storing.

Medium severitydata format

Power BI Refresh Error:
SYNAPSE_SQL_0012

What does this error mean?

A row in a Synapse dedicated SQL pool table exceeds the maximum supported row size of 8,060 bytes.

Common causes

1Wide tables with many VARCHAR columns storing large strings
2Multiple large NVARCHAR columns that are not sparsed
3Denormalized table design with excessive column count

How to fix it

1Step 1: Identify which columns contribute most to row size.
2Step 2: Move large VARCHAR/NVARCHAR columns to a separate wide-column table and JOIN as needed.
3Step 3: Use MAX types (VARCHAR(MAX)) — Synapse stores these off-row.
4Step 4: Consider compressing large text data before storing.

Frequently asked questions

How do I monitor for Row Size Exceeds Maximum in my pipelines?

Connect Azure Data Factory to MetricSign — failed pipeline runs trigger incident alerts with the root cause, so your team is notified before users notice report failures.

Official documentation: https://learn.microsoft.com/en-us/azure/synapse-analytics/sql/troubleshoot-synapse-studio