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7. You will not be applying any filters. Click Next. 8. Select the Create A Snapshot Immediately And Keep The Snapshot Available To Initialize Subscribers check box, and click Next. 9. Click Security Settings. 10. Select the option for Run Under The SQL Server Agent Service Account, along with the option for By Impersonating The Process Account, and click OK.

11

Volumes with file system errors are termed dirty. Unless repaired, a dirty volume will be thoroughly checked the next time the computer is rebooted. You can check a disk for errors on a volume by opening a command prompt and issuing the command CHKDSK. The output of CHKDSK is shown in Figure 3-5. If you use the /F option, CHKDSK attempts to repair any errors that it encounters on the volume.

In addition to using locking hints, the OUTPUT keyword for INSERT, UPDATE, and DELETE statements can also be very helpful. This keyword makes it possible to know which rows were accessed (inserted, updated, or deleted) by a specific DML statement. Following is an example of how concurrency problems can be solved without increased locking. The example is a simplified account-withdrawal transaction. (The lab for this lesson includes a more complex example that uses an account transactions table instead of just storing the account balance in a column of the accounts table.) Here s an example of the implementation in pseudo code:

It is not recommended to run the replication agents under the SQL Server Agent service account. The replication agent accounts should have minimal permissions in your environ ment, and the SQL Server Agent service account elevates those permissions. SQL Server 2005 Books Online has several good articles on setting replication security. You explicitly vio late the security best practices in the specific examples in this chapter for a good reason. This chapter is about learning the basics of replication and how it can fit into your environment. The purpose of these chapters is to become familiar with the engine before you take the step of deploying it across multiple instances with varying security requirements and locking down all the access. If you do not understand the basic operation of the engine before applying all the security to the agents, you will have a hard time understanding whether any errors you encounter are because of a situation that you introduced, a misconfiguration, or security blocking access. You should not run replication agents with this configuration in a production environment.

11. Click Next. Verify that the Create The Publication check box is selected. Click Next. 12. Give the publication a name, and click Finish. 13. When the wizard finishes creating the publication, click Close.

6

In this exercise you will create a subscription to the publication created in Exercise 1. 1. Expand Local Publications, right-click the publication you just created, and choose New Subscriptions. 2. Verify that your publication is selected, and click Next. 3. Verify that Run All Agents At The Distributor is selected, and click Next. 4. Select the check box next to your instance, and select the AWTranSubscriber data base from the Subscription Database drop-down list. Click Next. 5. Click the ellipsis button next to your subscriber in the Subscription Properties window. 6. Select the option for Run Under The SQL Server Agent Service Account, along with both options for By Impersonating The Process Account. Click OK, and then click Next. 7. On the Synchronization Schedule page, leave the Agent Schedule at the default of Run Continuously, and click Next. 8. Leave the Subscription Properties at Initialize Immediately, and click Next.

Figure 3-5

SET TRANSACTION ISOLATION LEVEL READ COMMITTED Default... BEGIN TRAN; IF EXISTS (SELECT * FROM Test.Accounts WHERE AccountNumber = @AccountNumber AND Balance >= @AmountToWithdraw) UPDATE Test.Accounts SET Balance = Balance - @AmountToWithdraw WHERE AccountNumber = @AccountNumber; ELSE BEGIN RAISERROR('Not enough funds in account!', 16, 1); ROLLBACK TRAN; RETURN; END COMMIT TRAN;

9. Verify that the Create Subscription(s) check box is selected. Click Next, and then click Finish. 10. When the subscription is created, click Close.

In this exercise, you will use Replication Monitor to view information about your pub lication and subscription. 1. Right-click the Replication node in Object Explorer, and choose Launch Replica tion Monitor. 2. Inspect the various selections and tabs to view the information that is now avail able on the publication and subscription that you created. 3. Right-clicking an entry enables you to view either properties of the object or fur ther details. 4. Practice posting tracer tokens, and observe the results.