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In this lab, you create two similar tables with a specific data validation rule. You apply using a trigger in one table and a check constraint in the other table and compare results.

Versions Supporting SQL Server Service Pack 4, Advanced Server Service Pack 4, Datacenter Server Service Pack 4

5

Service account passwords are retrieved from encrypted storage and do not need to be typed in each time a

1

Table 1-10

You will need to have SQL Server installed before you can complete this exercise. Refer to the Introduction for setup instructions.

Versions Supporting SQL Server Standard Edition Service Pack 1, Enterprise Edition Service Pack 1, Datacenter Edition Service Pack 1 Standard Edition Service Pack 1, Premium Edition Service Pack 1 (Windows-on-Windows 32-bit emulation) Standard Edition Service Pack 1, Enterprise Edi tion Service Pack 1, Datacenter Edition Service Pack 1

11

Exercise 1: Apply a Data Validation Rule to Tables In this exercise, you create two tables. One table will use a trigger to validate the rule, and the other table will use a check constraint. You then compare the insert performance by inserting 100,000 rows that adhere to the rule and 100,000 rows that do not adhere to the rule. The rule is very simple: the column Name must contain more than five characters. You insert all 100,000 rows in one insert statement by issuing an INSERT SELECT. You can also try to issue each insert separately; the result will be very different! 1. Open Microsoft SQL Server Management Studio and connect to an instance of SQL Server 2005. 2. In a new query window, type and execute the following SQL statements to create the TestDB database and the Test schema:

Table 1-11 Operating System Requirements: SQL Server 2005 Standard Edition, Workgroup Edition, 32-bit

Versions Supporting SQL Server Professional Service Pack 4, Server Service Pack 4, Advanced Server Service Pack 4, Datacenter Server Service Pack 4 Professional Service Pack 2, Media Edition Service Pack 2, Tablet Edition Service Pack 2 Standard Edition Service Pack 1, Enterprise Edition Service Pack 1, Datacenter Edition Service Pack 1 Standard Edition Service Pack 1, Premium Edition Service Pack 1 (Windows-on-Windows 32-bit emulation) Standard Edition Service Pack 1, Enterprise Edition Service Pack 1, Datacenter Edition Service Pack 1

Note the results of the creation of the TestDB database in Figure 5-4.

Table 1-12

This is a tedious procedure because it involves reconfiguring the services that run under the context of the account. However, unless you use exceptionally long (30 characters or more) and complex passwords, you should change the account credentials to frustrate password-cracking attackers.

Operating System Requirements: SQL Server 2005 Enterprise Edition (IA64), Standard Edition (IA64)

3. In a new query window, type and execute the following SQL statements to create the Test.TableWithCheckConstraint (including its check constraint) and Test.TableWithTrigger tables, as well as the trigger on Test.TableWithTrigger:

Versions Supporting SQL Server 64-bit Itanium Enterprise Edition Service Pack 1, 64-bit Itanium Datacenter Edition Service Pack 1

USE TestDB; GO CREATE TABLE Test.TableWithCheckConstraint ( Name NVARCHAR(50) NOT NULL CHECK(LEN(Name) > 5) ); CREATE TABLE Test.TableWithTrigger ( Name NVARCHAR(50) NOT NULL ); GO CREATE TRIGGER TableWithTriggerTestTrigger ON Test.TableWithTrigger AFTER INSERT, UPDATE AS BEGIN SET NOCOUNT ON; IF EXISTS (SELECT * FROM inserted WHERE LEN(Name) <= 5) BEGIN RAISERROR('Too short name found, rolling back t.', 16, 1); ROLLBACK TRAN; END END

Table 1-13 Operating System Requirements: SQL Server 2005 Enterprise Edition (X64),

The Windows operating system and SQL Server 2005 offer comprehensive toolsets, and you might not require all these tools and services for your SQL Server environment. In such cases, you must identify which Windows services are required for your SQL Server environment. You should not install services that are not required, and you should disable installed services you do not currently use. When a service is not installed or when you disable a service, a malicious user will not be able to use or exploit the service, thus reducing the attack surface of your servers.

Standard Edition (X64)

4. Open a new query window and execute the following SQL statements to create a table containing 100,000 rows. This table will be used to issue the INSERT SELECT statement against the previously created tables. This query might take several minutes to finish executing.