What causes SYNAPSE_SQL_0014?

File format does not match the external file format definition (delimiter, header row, encoding). Data type mismatch between the source file and the destination table column. Invalid or corrupted rows in the source file. Insufficient permissions on the storage account for the Synapse managed identity

How do I fix SYNAPSE_SQL_0014?

Step 1: Enable PolyBase rejection options to identify bad rows: `WITH (MAXERRORS = 10, REJECTTYPE = VALUE)`. Step 2: Use COPY INTO with ERRORFILE option to capture rejected rows for inspection.. Step 3: Validate the source file format against the EXTERNAL FILE FORMAT definition.. Step 4: Grant Storage Blob Data Reader on the storage account to the Synapse managed identity.

Medium severityconfiguration

Power BI Refresh Error:
SYNAPSE_SQL_0014

What does this error mean?

PolyBase or the COPY INTO statement failed when loading data from an external source into Synapse dedicated SQL.

Common causes

1File format does not match the external file format definition (delimiter, header row, encoding)
2Data type mismatch between the source file and the destination table column
3Invalid or corrupted rows in the source file
4Insufficient permissions on the storage account for the Synapse managed identity

How to fix it

1Step 1: Enable PolyBase rejection options to identify bad rows: `WITH (MAXERRORS = 10, REJECTTYPE = VALUE)`
2Step 2: Use COPY INTO with ERRORFILE option to capture rejected rows for inspection.
3Step 3: Validate the source file format against the EXTERNAL FILE FORMAT definition.
4Step 4: Grant Storage Blob Data Reader on the storage account to the Synapse managed identity.

Frequently asked questions

How do I monitor for PolyBase Error Loading from External Source 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