A data catalog is an organized inventory of an organization's data assets, enriched with metadata that makes each asset findable, understandable, and trustworthy.
What a Data Catalog Contains
A data catalog typically includes entries for each dataset, database table, report, or data feed. Each entry contains metadata: name, description, owner, steward, classification, update frequency, data dictionary, lineage, and access information. Think of it as the library catalog for your organization's data — without it, analysts spend hours searching for data that already exists.
Business Glossary
Many data catalogs include a business glossary: a dictionary of business terms and their definitions. The glossary connects business language to technical data assets. When a business user searches for "customers," the glossary links that term to the specific tables and fields that contain customer data. This bridge between business and technical language is one of the most valuable things a catalog provides.
Data lineage tracks where data comes from and how it has been transformed. A catalog entry might show that a reporting dataset was derived from three source systems, transformed by a specific ETL process, and loaded on a specific schedule. Lineage builds trust and supports troubleshooting — when a report shows unexpected numbers, lineage tells you exactly where to look.
Open Data Catalogs
Government open data portals are essentially public data catalogs. The federal open.canada.ca portal uses the DCAT metadata standard to describe each dataset. Provincial and municipal portals follow similar approaches. When you search for a dataset on a government portal, you are using a data catalog.
Catalog Tools
Data catalog tools range from simple spreadsheets to enterprise platforms like Alation, Collibra, and Apache Atlas. The right tool depends on the size and complexity of your data environment. Many organizations start with a well-structured spreadsheet and graduate to a dedicated tool as their governance program matures.
Key Takeaways
- A data catalog is the inventory of your organization's data assets
- Each entry combines descriptive, structural, and administrative metadata
- A business glossary bridges business language and technical data
- Lineage in the catalog builds trust and supports troubleshooting
Learn how metadata enables data Discovery.