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You can use the new Audit feature to create granular audits at both a server and database level as needed to match your organization s custom auditing requirements. In comparison to other auditing options such as the C2 audit mode (described in SQL Server BOL), it offers a much more flexible option, while enabling powerful features such as portability of database audit specifications when transferred between servers. Let s look at another feature that can be employed as part of a custom auditing solution: DDL triggers.

means of either auditing or preventing data definition statements. Not to be confused with DML (Data Manipulation Language) triggers, DDL triggers are defined on events such as CREATE TABLE. From an auditing perspective, they enable customized data to be collected for particular events. Let s walk through a simple example to highlight the power and flexibility of DDL triggers. Suppose we want to capture the details related to the creation of new tables, including the T-SQL statement used to create the table, the user that executed the statement, and the date and time of the creation. Consider the T-SQL code in listing 6.3. We ll first create a table used to store the required details, before creating the DDL trigger that uses the EVENTDATA function to return the required details.

2(112 - 8) ]-2=21-2=01

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-- create the table to store the audit details CREATE TABLE dbo.CREATE_TABLE_LOG ( eventTime datetime , eventOwner nvarchar(100) , eventTSQL nvarchar(3000) ) GO -- create the DDL trigger CREATE TRIGGER DDLTrigger_CreateTable ON DATABASE FOR create_table AS DECLARE @data XML SET @data = EVENTDATA() INSERT INTO CREATE_TABLE_LOG VALUES ( GETDATE() , CURRENT_USER , @data.value('(/EVENT_INSTANCE/TSQLCommand/CommandText)[1]', 'nvarchar(1000)') ) GO

Listing 6.3 obtains the T-SQL command from the EVENTDATA function, which returns information about server or database events. As such, it s ideal for use in the body of a DDL trigger.

This area comes out positive and very small, about as expected considering the curve The previous problem illustrates an important point Be careful when finding an area below the axis You can end up with a negative number for the area The next problem is a typical test problem involving positive and negative area There is a simple way out of Insight this negative area situation, as illustrated in the next problem

With the table and trigger in place, a table creation command will fire the trigger and capture the associated event data. The results appear in figure 6.12. Not only can DDL triggers audit actions, they can also actively prevent certain changes. Consider the example shown in listing 6.4, which rolls back any attempt to drop or alter a table definition.

CREATE TRIGGER DDLTrigger_PreventTableChanges ON DATABASE FOR DROP_TABLE, ALTER_TABLE AS PRINT 'Cannot drop or modify tables in this database' ROLLBACK

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As listing 6.4 shows, the ROLLBACK statement rolls back any attempt to drop or alter any table in the database in which the trigger is created, along with the error message Cannot drop or modify tables in this database. Similar to DDL triggers, logon triggers, discussed next, enable auditing and control of the logon process.

7-18

In a manner similar to creating DDL triggers, you create a logon trigger to either roll back (deny) a logon or capture information surrounding the logon using the EVENTDATA function. Consider the example shown in listing 6.5, which prevents ReportUser from logging on between 11 p.m. and 11:30 p.m.

CREATE TRIGGER validateLogonTrigger ON ALL SERVER WITH EXECUTE AS 'logonTrigger' FOR LOGON AS BEGIN DECLARE @time time(0) = getdate() IF ORIGINAL_LOGIN() = 'ReportUser' AND @time BETWEEN '23:00:00' and '23:30:00' ROLLBACK END

With the trigger in place, a logon attempt by ReportUser between 11 p.m. and 11:30 p.m. will be met with an error message similar to the one displayed in figure 6.13. In our example, we used the ORIGINAL_LOGON function. There are a number of other functions that can be used, such as APP_NAME; however, as you ll see in chapter 16, careful consideration needs to be given to the function used, due to the possibility of function values being spoofed to circumvent the intention of logon triggers. In closing our coverage of auditing features, let s consider another new feature in SQL Server 2008: Change Data Capture.

Solution: Do not write down the integral of x 2 + x - 2 with the prescribed limits and perform the integration to find the answer If you do, you will get the problem wrong!

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