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In this exercise, you create a DDL trigger that prevents any table from being dropped. 1. If necessary, launch SSMS, connect to your instance, open a new query window, and change the context to the AdventureWorks database. 2. Create the DDL trigger by executing the following code:

Linked servers usually handle distributed queries. A distributed query is a query that accesses data from multiple heterogeneous data sources. SQL Server 2005 supports distributed queries by using OLE DB, a replacement technology for ODBC. Because they use OLE DB, you can use distributed queries to access the following information from an instance of SQL Server 2005:

PRINT 'You are in Production. Tables cannot be dropped!' ROLLBACK ;

The CLR security system provides a way to control the kinds of operations managed code can perform by assigning permissions to code. Code access permissions are assigned based on the signature, or strong name of the code. The CLR offers a system-wide policy that can be set by the system administrator. This policy defines the permissions for any managed code running on the system. In addition, the CLR host provides additional security to specify additional restrictions on managed code. If a managed API in the .NET Framework exposes operations on resources that are protected by a code access permission, the API will demand that permission before accessing the resource. This demand causes the CLR security system to trigger a comprehensive check of every assembly in the chain. Only if the entire call chain has permission will access to the resource be granted.

3. Create a table for testing purposes, as follows:

(ID int NOT NULL);

Data stored in multiple instances of SQL Server Heterogeneous data stored in many different types of data sources that allow access via an OLE DB provider

Host Protection Attributes (HPAs)

4. Try to drop the table just created by executing the following code:

The CLR provides a mechanism for interacting with managed APIs that are part of the .NET Framework and have certain attributes that might be of interest to a host of the CLR. For

DROP TABLE dbo.DropTest;

5. Verify that the table still exists by executing the following code:

The term heterogeneous data is another way of saying data stored in multiple formats for example, it can be used to describe data stored on a SQL Server database, on an open source database, in an access database, or within an Excel spreadsheet.

example, the SharedState attribute indicates whether the API exposes the ability to create or manage static class fields. Synchronization indicates whether the API exposes the ability to perform thread management. ExternalProcessMgmt indicates whether the API exposes a way to control the host process. Given these attributes, the developer can specify a list of HPAs, such as the SharedState attribute, that should be disallowed in the hosted environment. In this case, the CLR denies attempts by user code to call APIs that are annotated by the HPAs in the prohibited list.

DDL triggers fire in response to DDL events that occur on the server, such as cre ating, altering, or dropping an object. The main purpose of DDL triggers is to provide an additional means of security as well as to audit any DDL commands issued against a database.

You can use the following questions to test your knowledge of the information in Les son 2, Designing Database Security. The questions are also available on the compan ion CD if you prefer to review them in electronic form.

In SQL Server 2005, several database object types can be implemented in CLR code. These object types are as follows:

Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.

Figure 6-19 provides a basic outline of the linked server process. Linked servers activate when a client application executes a distributed query against the linked