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The Architectural Mistakes That Kill Data Warehouses

Organizations that start loading data into BigQuery without a design discipline end up with a collection of tables that happen to live in the same GCP project. There is no consistent naming convention. The same entity is modeled differently in different datasets. Some tables have no partitioning because nobody thought about how they would be queried. Queries that should take two seconds scan terabytes instead of gigabytes because the clustering keys are wrong. The data engineers can't tell which tables are in production use and which are ad-hoc explorations from six months ago.

Data warehouse architecture prevents this. It is the upfront investment that makes everything else — pipelines, dashboards, data quality — maintainable at scale.

Architecture Layers We Design

Bronze / Silver / Gold (Medallion Architecture)

We apply a layered architecture that separates raw ingested data (Bronze) from cleaned and conformed data (Silver) from business-ready aggregated and modeled data (Gold). This separation creates clear boundaries: pipelines load Bronze, transformation logic produces Silver and Gold, dashboards query Gold. Each layer has a documented purpose, a defined schema ownership, and an access control policy.

BigQuery Dataset and Table Architecture

Dataset structure design: how to group tables across projects and datasets to reflect data domains, team ownership, and access control requirements. Table design: column selection, data types, nullable vs. required, repeated and nested fields where appropriate. Partitioning strategy: ingestion-time vs. column-based partitioning, partition expiry, and partition filter requirements. Clustering key selection aligned to the query patterns that the visualization layer and analytical workloads will generate.

Schema Design for Analytical Queries

Dimensional modeling (star schema, snowflake schema, or wide denormalized tables depending on the query patterns). Slowly changing dimension strategies. Surrogate key design. Fact table grain definition — the most important decision in dimensional modeling, and the one most often made incorrectly.