This unity catalog metastore is distinct from the metastore included in Databricks workspaces created before Unity Catalog was released. Each metastore that is configured will assign to databricks workspace.

When an administrator configures the metastore, it should specify the storage account, Owner to give access to metastore and enable delta sharing to allow secure data transfer. Metastore in the unity catalog is a top-level container. We can also create read-only Views from tables.

Table: The lowest level in the object hierarchy, tables can be external (stored in external locations in cloud storage of choice) or managed tables (stored in a storage container in cloud storage that we create expressly for Databricks).

Schema: Also known as databases, schemas are the second layer of the object hierarchy and contain tables and views.

Catalog: The first layer of the object hierarchy is used to organize our data assets.

Each metastore exposes a three-level namespace ( catalog.

Metastore: The top-level container for metadata.

In Unity Catalog, the hierarchy of primary data objects flows from metastore to table. Unity Catalog automatically captures user-level audit logs that record access to our data. Unity Catalog’s security model is based on standard ANSI SQL and allows administrators to grant permissions in their existing data lake using familiar syntax at the level of catalogs, databases (also called schemas), tables, and views. Unity Catalog offers a single place to administer data access policies that apply across all workspaces and personas. Users in different workspaces can share access to the same data, depending on privileges granted centrally in Unity Catalog. With Unity Catalog, admins and data stewards manage users and their access to data centrally across all workspaces in an Azure Databricks account. What can be achieved with the help of Unity Catalog?

Unity Catalog is a unified governance solution for all data and AI assets in our lakehouse on any cloud, including files, tables, machine learning models, and dashboards.

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