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In environments with lots of server instances and many DBAs, some sites prefer to avoid having all DBAs defined as members of the sysadmin role and lean toward a more granular approach whereby some DBAs are allocated a subset of responsibilities In supporting this, SQL Server provides a number of fixed server roles in addition to the sysadmin role, which grants the highest level of access to the server instance An example of a fixed server role is the processadmin role, used to grant users permissions to view and kill running server processes, and the dbcreator role, used to enable users to create, drop, alter, and restore databases SQL Server BOL contains a complete listing of the fixed server roles and their permissions Similar to fixed server roles, fixed database roles come with predefined permissions that enable a subset of database permissions to be allocated to a specific user.

Solution: This has got to be an odd looking curve Start by looking a where the curve crosses the axes At t x = O , y = - 2 andat y = O , x = 4 Oneotherpoint, x = 1 , y = -1 , is sufficient, along with the points where the curve crosses the axes, to sketch in the curve as shown in Fig 7-8

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FIXED DATABASE ROLES In addition to the db_owner role, which is the highest level of permission in a database, SQL Server provides a number of fixed database roles Again, all of these roles and descriptions are defined in BOL Commonly used fixed database roles are the db_datareader and db_datawriter roles, used to grant read and add/delete/modify permissions respectively to all tables within a database One of the nice features of permissions management within SQL Server is that roles can include other roles For example, the db_datareader role could contain the custom ViewSales database role that we created earlier, in effect granting select permissions on all tables to members of the ViewSales role, in addition to the other permissions granted with this role So far in this chapter, we ve addressed techniques used to prevent unauthorized access.

If such access be gained, it s important we have auditing in place, a topic we ll address next..

Fig 7-8

Auditing solutions are built to enable retrospective analysis of user activity. SQL Server 2008 introduces a number of enhancements in this regard, which will be the focus of this section. We ll begin with coverage of the new SQL Server Audit feature before looking at DDL and logon triggers. We ll finish with a brief look at another new feature in SQL Server 2008, Change Data Capture.

In SQL Server 2005 and earlier, auditing options consisted of simple server-level logon success/failure logging, custom audits using server-side traces or SQL Profiler, or the C2 trace option. What was missing was a more granular auditing option whereby a custom audit trace could be easily created that captured specific events such as executing DBCC commands.

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In addition to all of the auditing options in 2005, SQL Server 2008 introduces a comprehensive new auditing model that addresses the need to easily create granular audit specifications. The new Audit feature in SQL Server 2008 consists of three main components: An audit, which specifies the location of the audit output (file, application, or security event log), an option to shut down SQL Server if the audit can t be written, and a queue delay setting that specifies the number of milliseconds that can pass before audit actions are processed Server audit specifications, which contain definitions of server-level audit events such as server logins Database audit specifications, which contain definitions of database level events such as schema modifications Let s walk through an example of creating an audit solution using SQL Server Management Studio. The first step is to create an audit. First right-click on Audits under Security and choose New Audit. As shown in figure 6.8, the Create Audit screen lets you specify various properties, including the file path if the audit destination is file based. As with most other parts of Management Studio, use the Script button to save the creation script for later inspection. Both server and database audit specifications are created in the context of a matching audit. The audit events collected are sent to the Audit object, and written to either file or the event log, as defined in the Audit object. Known as audit action groups, both server- and database-level audit specifications have a wide variety of audit actions that can be captured. Let s continue by defining a server audit specification. SQL Server BOL contains a full list of all possible server-level audit actions that can be chosen. For this example, let s create a specification that will

How can the area come out negative Are areas below the axis negative Just to be sure, change the limits on the integral to 4 and 5 and see if that area comes out positive, as we would expect from the graph

Figure 6.9 Once an audit has been defined, you can define audit specifications that use the audit. The specification can be at a server level (as shown here) or at a database level.

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