5: Advanced Database Objects in .NET framework

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5: Advanced Database Objects
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Just using stored procedures doesn t always protect us If we create dynamic SQL within the stored procedure, we have the same problem The following code shows an example of an unprotected stored procedure The parameters aren t being compared within the script, but instead are being added completely within the dynamically built SQL statement
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CREATE Proc dbousp_SQLInjection @login nvarchar(20), @password nvarchar(20) AS DECLARE @mySQL nvarchar(1000) SET @mySQL = 'SELECT * FROM Users ' SET @mySQL = @mySQL + 'WHERE login = ' + @login SET @mySQL = @mySQL + 'AND password = ' + @password + ';' EXEC sp_executesql @statement = @mySQL
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With any type of security, we should always look for defense in depth; we try to protect ourselves on many levels Parameterized stored procedures are a great protection against SQL injection, but we should always look to implement security in many different ways, on many different levels
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The SQL Server database engine optimizes and compiles a stored procedure the first time it s run The result is stored in cache Depending on variables such as how much memory is available to SQL Server and how often the stored procedure is run, it may stay in cache indefinitely, or it may be optimized and recompiled each time it is run There are some times when you want to make sure it is recompiled Usually this is due to a very active OLTP database resulting in statistics for indexes being updated quite often For example, let s say that you have a stored procedure that queries several tables and produces a report We run the report today, and SQL identifies the best plan to create the report Since our server has a lot of memory, the compiled plan stays in cache The next day we run the plan again However, between yesterday and today, the updates to the database have made the original plan less than ideal Running the plan today takes three times as long because the indexes that are used in the plan have been heavily modified If instead we were to force the stored procedure to be recompiled, SQL Server would identify the best plan based on the current state of the database We would lose a little time in the initial recompilation, but in this example we save time in the long run Let me stress, though, that forcing stored procedures to be recompiled each time they are run is the exception SQL Server will regularly look at different variables such as the statistics of indexes and if needed, it will automatically recompile stored procedures Additionally, any time the UPDATE STATISTICS command is issued against a table or view, stored procedures that use this table or view will automatically be recompiled
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MCITP SQL Server 2005 Database Administration All-in-One Exam Guide
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EXAM TIP Ideally, stored procedures will stay in cache as long as they re being used If you find they are regularly being recompiled, you might like to look for an automated script scheduled to run regularly and updating all the statistics Updating the statistics will immediately purge them from cache
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Triggers
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Overview of Triggers
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Triggers provide a lot of power for DBAs They allow us to enforce business rules and ensure data integrity We can audit changes to data, changes to database objects, roll back unacceptable changes, and much more A trigger is a special type of stored procedure that fires in response to other actions In other words, we can t call or execute a trigger directly as we can other stored procedures Triggers are associated with specific actions (UPDATE, INSERT, and DELETE) on a table An UPDATE trigger configured on a table or view will fire in response to an UPDATE on the table or view Likewise, an INSERT or DELETE trigger configured on a table or view will fire in response to an INSERT or DELETE on the table or view One great benefit of a trigger is that it will fire no matter what is causing the action If you want to monitor updates to the data, a trigger will catch it if it was updated from a function, stored procedure, a direct UPDATE statement, or any other method We have two primary types of triggers as outlined in Table 5-3 Note that only DML triggers can be configured as INSTEAD OF triggers
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