Error in Mirrored google Big query

Hi Anonymous ,
Thanks for reaching out to Microsoft Fabric Community forum.

I understand you're encountering errors with Mirrored Google BigQuery tables in Fabric and are evaluating whether mirroring or a custom CDC pipeline is more suitable for your scenario involving approximately 15 tables with crores of rows. Here’s an overview: Mirroring Errors - The Internal system error occurred (ArtifactId …) may result from: Transient issues : Reseed by navigating to Configure replication, deselecting and saving the affected tables, then re-enabling them. Gateway version/connectivity : Confirm your On-Premises Data Gateway is at least version 3000.286.6. Permissions : Ensure the service account has roles/bigquery.admin and roles/storage.admin. Unsupported objects : Only tables are supported; replace any views with materialized tables. Lag : Mirroring introduces a delay (10–15 minutes for CDC); polling slows if there is no new data. If these steps do not resolve the issue, please collect the ArtifactId, table name, timestamp, and mirrored item URL and submit a Fabric support ticket.

Mirroring vs. Custom Pipeline For large tables: Mirroring: Offers easy setup and automated CDC, suitable for near-real-time requirements, but is less flexible and currently in preview, which may lead to errors and higher costs with frequent changes. Custom CDC pipeline: Requires more initial configuration, enables scheduled loads and selective data management, and may be more cost-effective if real-time sync is not required.

Recommendation: For near real-time analytics, proceed with Mirroring after resolving any gateway or permission issues. For daily or less frequent refreshes and optimized cost management, a custom CDC pipeline is advisable.