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If you grant object privileges to roles, you can make the privileges selectively available.
Object privileges for users and roles can be granted or revoked using the following: A user automatically has all object privileges for schema objects contained in his or her schema.
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.
The procedure's owner must have all the necessary object privileges for referenced objects.
Fewer privileges have to be granted to users of a definer-rights procedure, resulting in tighter control of database access.
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DML object privileges for tables can be applied similarly to views.
A user can receive a privilege in two different ways: A system privilege is the right to perform a particular action, or to perform an action on any schema objects of a particular type.
For example, the privileges to create tablespaces and to delete the rows of any table in a database are system privileges. You can grant or revoke system privileges to users and roles.
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You grant privileges to users so these users can accomplish tasks required for their job.