SQL SERVER PERMISSIONS AND THE NEW OBJECTS this does two ownership checks even if FRED is DBO select_and_count GO By default, procedural code that uses a nondefault execution context can only access resources in the current database that is, you may not use three-part names at all. This is to guard against a user with DBO privilege in one database gaining access to data in another database. If you need to access resources in another database or system-level resources, you must grant appropriate permissions to the executor of the code. Another option is to sign the code with a certificate, map the certificate to a login, and grant permissions to the certificate. This option is in development at the time of this writing. SQL Server Permissions and the New Objects We have six new kinds of SQL Server objects in the managed world of SQL Server 2005. Three of these objects are managed code variations on SQL Server objects: Stored procedures User-defined functions Triggers Three of the objects are new with SQL Server 2005: Assemblies User-defined types User-defined aggregates The reason that all these objects are new is that they all run executable code, rather than having SQL Server run the code. In previous versions of SQL Server, extended stored procedures or COM objects using COM automation to run code always ran that code in the context of the Windows user account that was running the SQL Server service process. With the introduction of a managed environment that can control aspects of code loading (through the assembly loading policy mentioned in Chapter 2) and code execution through Host Protection Attributes (HPAs) that work through code access security, execution of .NET assembly code is safer

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