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Ownership chaining doesn't apply to dynamic SQL executed within the
module.
If the user had access to the database but not to any of its objects, a
query against sys. Most of the old system tables, stored procedures, and
views are still available for use, except that they are now all exposed
as read-only views. She is finally able to successfully create the
CarolSchema. And every database user automatically belongs to the fixed
Public role.
Also notable is that objects can be secured by granting or denying
permissions. What if you want to create a stored procedure that uses
another user's security context to check permissions as part of a
carefully designed security framework to protect data?
In order to grant cross-database permissions, you'll have to create a
duplicate user in each database and separately assign each database's
user the permission.
The REVERT statement reverts the execution context to the admin user.
Cross-database permissions are not allowed.
" In this case, the problem is that Carol doesn't have permission to
create objects in the dbo schema.
The creator of the module must have IMPERSONATE permissions for the
specified user.
For example, the sysobjects metadata is now exposed through the sys.
The following is an example that runs the code with a specific user's
permissions. There are a few limitations to changing the execution
context of code.
SQL Server only checks permissions for broken ownership chains, so if
the owner of the code also owns the underlying objects, only the
module's execute permission is checked.
For example, TRUNCATE TABLE requires the ALTER permission on the table,
which confers the power to do more than just delete a table's rows.
Granting a particular permission can convey the rights of other
permissions through implication. The ALTER ANY ASSEMBLY permission
within the scope of a specific database allows the grantee to make
changes to any assembly.
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