Access control in Unity Catalog

Access control in Unity Catalog is built on the following complementary models:

• Privileges and ownership control who can access what, using grants on securable objects.
• Attribute-based policies (ABAC) control what data users can access, using governed tags and centralized policies.
• Table-level filtering and masking control what data users can see within tables using table-specific filters and views.
• Workspace-level restrictions control where users can access data, by limiting objects to specific workspaces.

These models work together to enforce secure, fine-grained access across your data environment.

When to use each access control mechanism

Workspace bindings, privileges, and ABAC policies all evaluate access at different levels, and they are designed to be used together. The following table compares them across common access control criteria:

Note

Databricks recommends using attribute-based access control (ABAC) to centralize and scale access control based on governed tags. Use row filters and column masks only when you need per-table logic or haven't adopted ABAC yet.

Mechanism	Applies to	Defined using	Use case
Privileges	Catalogs, schemas, tables	Grants (GRANT, REVOKE), ownership	Baseline access and delegation
ABAC policies	Tagged objects (tables, schemas)	Policies with governed tags and UDFs	Centralized, tag-driven policies and dynamic enforcement
Table-level row/column filters	Individual tables	UDFs on the table itself	Table-specific filtering or masking
Workspace bindings	Catalogs, external locations, storage credentials	Workspace assignment	Restricting access to objects from specific workspaces

Permissions model

Topic	Description
Permissions concepts	Understand the Unity Catalog object hierarchy, privilege inheritance, and how access flows from parent to child objects.
Privileges reference	View detailed descriptions of every privilege in Unity Catalog.
Admin roles	Learn about account admin, workspace admin, and metastore admin roles and their scopes.

Manage access

Topic	Description
Manage privileges	Grant, revoke, and inspect privileges on Unity Catalog objects using Catalog Explorer and SQL.
Access requests	Configure destinations for access requests on Unity Catalog securable objects, including email, Slack, Teams, and webhooks.
Workspace-catalog binding	Restrict which workspaces can access specific catalogs, external locations, and storage credentials.

Fine-grained data access

Topic	Description
Attribute-based access control (ABAC)	Define centralized, tag-driven policies that dynamically filter and mask data across your catalog.
Row filters and column masks	Apply per-table row and column filters using UDFs to control what data users see at query time.