Privileges

Privileges granted to a user or role determine which operations the user or role can perform on certain objects. Privileges can be used to implement fine-grained access control to safeguard data security.

This topic describes privileges provided by CelerData on different objects and their meanings. Privileges are granted and revoked by using GRANT and REVOKE. The privileges that can be granted on an object are specific to the object type. For example, table privileges are different from database privileges.

Privilege list

This section describes privileges that are available on different objects.

ACCOUNT

Privilege	Description
GRANT	Creates a user or role, alters a user or role, or grants privileges to a user or role. This privilege cannot be directly granted to users or roles. The user_admin role has this privilege.
CREATE EXTERNAL CATALOG	Creates an external catalog.
REPOSITORY	Creates, deletes, or views repositories.
OPERATE	Manages replicas, configuration items, variables, and transactions.
CREATE GLOBAL FUNCTION	Creates a global UDF.

USER

Privilege	Description
IMPERSONATE	Allows user A to perform operations as user B.

GLOBAL FUNCTION (Global UDFs)

Privilege	Description
USAGE	Uses a function in a query.
DROP	Deletes a function.
ALL	Has all the above privileges on a function.

CATALOG

Object	Privilege	Description
CATALOG (internal catalog)	USAGE	Uses the internal catalog (default_catalog).
CATALOG (internal catalog)	CREATE DATABASE	Creates databases in the internal catalog.
CATALOG (internal catalog)	ALL	Has all the above privileges on the internal catalog.
CATALOG (external catalog)	USAGE	Uses an external catalog to view tables in it.
CATALOG (external catalog)	DROP	Deletes an external catalog.
CATALOG (external catalog)	ALL	Has all the above privileges on the external catalog.

NOTE

The internal catalog in your CelerData cluster can not be deleted.

DATABASE

Privilege	Description
ALTER	Sets properties for a database, rename a database, or sets quotas for a database.
DROP	Deletes a database.
CREATE TABLE	Creates tables in a database.
CREATE VIEW	Creates a view.
CREATE FUNCTION	Creates a function.
CREATE MATERIALIZED VIEW	Creates a materialized view.
ALL	Has all the above privileges on a database.

TABLE

Privilege	Description
ALTER	Modifies a table or refreshes metadata in an external table.
DROP	Drops a table.
SELECT	Queries data in a table.
INSERT	Inserts data into a table.
UPDATE	Updates data in a table.
EXPORT	Exports data from a table.
DELETE	Deletes data from a table based on the specified condition or deletes all the data from a table.
ALL	Has all the above privileges on a table.

VIEW

Privilege	Description
SELECT	Queries data in a view.
ALTER	Modifies the definition of a view.
DROP	Deletes a logical view.
ALL	Has all the above privileges on a view.

MATERIALIZED VIEW

Privilege	Description
SELECT	Queries a materialized view to accelerate queries.
ALTER	Changes a materialized view.
REFRESH	Refreshes a materialized view.
DROP	Deletes a materialized view.
ALL	Has all the above privileges on a materialized view.

FUNCTION (Database-level UDFs)

USAGE	Uses a function.
DROP	Deletes a function.
ALL	Has all the above privileges on a function.