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is then loaded into your SQL Server instance by a member of the sysadmin role. .NET assemblies use Code Access Security (CAS) to restrict the allowable set of oper ations that can be performed. SQL Server also uses CAS to lock down the managed code and ensure the integrity of the database server and operating system. When creating the assembly, the sysadmin specifies the level of CAS that is applied to the assembly. The access permissions available for assemblies are SAFE, EXTERNAL_ACCESS, and UNSAFE. SAFE is the default permission set and does not allow access to resources external to the SQL Server instance or to any machine resources. EXTERNAL_ACCESS enables an assembly to access resources external to the SQL Server instances such as files, shares, and network resources. UNSAFE access enables the assembly to perform any operation and access any resource. Running assemblies in UNSAFE mode is very strongly discouraged. To execute code in assemblies set to either EXTERNAL_ACCESS or UNSAFE mode requires a DBA to ensure that the assemblies meet several requirements and that sev eral permissions are set. The assemblies must be strongly typed as well as code-signed with a certificate, and the certificate has to have been mapped to a SQL Server login. The lo gin created must have per missions to r un assemblies in eit her EXTERNAL_ACCESS or UNSAFE mode. Additionally, the database owner must also have permissions to run assemblies in either EXTERNAL_ACCESS or UNSAFE mode with the TRUSTWORTHY database option turned on. SQL Server is secure in deployment. To execute code that could be potentially harm ful or have elevated permissions, you have to meet a significant number of require ments. You can t accidentally execute CLR assemblies in either EXTERNAL_ACCESS or UNSAFE mode.

1. What are the three access modes for .NET assemblies 2. How can you configure the SQL Server authentication mode 3. What is the purpose of SQL Server Agent proxy accounts 4. What tool should you use to change SQL Server service accounts and pass words

1. SAFE, EXTERNAL_ACCESS, and UNSAFE 2. Windows only or Mixed: SQL Server and Windows authentication 3. To encapsulate security access by proxying a security account for a given subsystem such as SSIS 4. SQL Server Configuration Manager

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In this exercise, you change the password for the SQL Server service account. 1. In the Start menu, choose Administrative Tools, Computer Management. 2. Select the Users node under Local Users And Groups. 3. Right-click the Windows login SQLSERVER (created in 4, Designing Database Server Security Policies ), and choose Set Password. 4. Change the password for the account. 5. Launch SQL Server Configuration Manager, select the SQL Server 2005 Services node, and double-click the SQL Server service in the right pane. 6. Change the account name to SQLSERVER, and change Password to the pass word that you set in step 4. 7. Click OK. 8. Stop and restart the SQL Server service, and verify that the SQL Server starts.

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Costs of downtime for applications that do not directly generate revenue but support business operations such as inventory management systems, human resources, and marketing are a bit more difficult to calculate. For supporting applications, you need to understand the percentage of overall business operations that a particular applica tion affects. Using the same revenue figures, calculate the percentage of revenue an application affects and scale it into a cost-per-minute value. After you have the figures for the downtime cost, multiply them by a factor of 3. So the $950-per-minute cost of downtime becomes an estimated downtime cost of $2,850 per minute. Although this number might seem a bit arbitrary, the factor of 3 is used to attempt to encompass all the intangible costs of downtime. Customers who try to place an order and find that the system is unavailable might go to your competitors to order a similar product. It is possible that any customer who gives up because the order system is not available might be lost forever to these com petitors. Outages also can affect a company s reputation. Because a company s image is the most important asset for generating business, bad publicity because of an outage might cost the business several orders of magnitude more than bottom-line revenue. By factoring all the intangible aspects such as loss of image, bad publicity, potential loss of staff, loss of customers, and so on you can better evaluate the costs associated with not having systems available.

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