BigQuery Migration Metadata Extraction

Extraction runs the DWH migration extractor (dwh-migration-dumper) through two gcloud commands to collect catalog DDL and query history—not table row data. If the user wants to migrate table rows (such as Snowflake COPY INTO unloads), ask whether they prefer the [BigQuery Data Transfer Service][bq_dts] (including the [Snowflake connector][snowflake_dts]) or exporting to Cloud Storage and loading with bq load. Both extract commands are in the alpha release track:

Both take the same arguments. gcloud flags come first; the extractor's own flags come after -- and are passed to the extractor unchanged: