What causes SYNAPSE_SQL_0015?

Delta Lake table was written by Databricks using a Delta protocol version not yet supported by Synapse. The transaction log (_delta_log) is corrupted or incomplete. Delta Lake table uses deletion vectors or liquid clustering (not supported in Synapse Serverless). The Delta table path is incorrect or the folder does not contain a _delta_log directory

How do I fix SYNAPSE_SQL_0015?

Step 1: Verify the Delta table path contains a `_delta_log` directory.. Step 2: Check the Delta protocol version: `spark.sql('DESCRIBE DETAIL ').show()` in Databricks.. Step 3: If using deletion vectors, disable them: `ALTER TABLE ... SET TBLPROPERTIES ('delta.enableDeletionVectors' = false);`. Step 4: As a workaround, export the Delta table to Parquet and query via OPENROWSET.. Step 5: Monitor Synapse release notes for updated Delta Lake feature support.

High severityconfiguration

Power BI Refresh Error:
SYNAPSE_SQL_0015

What does this error mean?

Synapse Serverless SQL cannot read a Delta Lake table — typically due to an unsupported Delta feature or transaction log issue.

Common causes

1Delta Lake table was written by Databricks using a Delta protocol version not yet supported by Synapse
2The transaction log (_delta_log) is corrupted or incomplete
3Delta Lake table uses deletion vectors or liquid clustering (not supported in Synapse Serverless)
4The Delta table path is incorrect or the folder does not contain a _delta_log directory

How to fix it

1Step 1: Verify the Delta table path contains a `_delta_log` directory.
2Step 2: Check the Delta protocol version: `spark.sql('DESCRIBE DETAIL <table>').show()` in Databricks.
3Step 3: If using deletion vectors, disable them: `ALTER TABLE ... SET TBLPROPERTIES ('delta.enableDeletionVectors' = false);`
4Step 4: As a workaround, export the Delta table to Parquet and query via OPENROWSET.
5Step 5: Monitor Synapse release notes for updated Delta Lake feature support.

Frequently asked questions

How do I monitor for Delta Lake Read Error in Serverless SQL 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