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A schema object and its synonym are equivalent with respect to privileges.That is, the object privileges granted for a table, view, sequence, procedure, function, or package apply whether referencing the base object by name or using a synonym.For example, assume there is a table If a synonym is dropped, all grants for the underlying schema object remain in effect, even if the privileges were granted by specifying the dropped synonym.Schema object privileges can be granted to and revoked from users and roles.At runtime, the privileges of the owner of a definer-rights stored procedure are always checked before the procedure is executed.
Because these privileges allow other users to alter or create dependencies on a table, you should grant privileges conservatively.
A user attempting to perform a DDL operation on a table may need additional system or object privileges.
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You grant privileges to users so these users can accomplish tasks required for their job.
Views add two more levels of security for tables, column-level security and value-based security: object privilege for a specific procedure can execute the procedure or compile a program unit that references the procedure.