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SELECT * FROM Test.TestTran; /* Returns the 2 rows in the table. This statement is allowed because it does not change any rows that are included in the transaction in connection 1. */ UPDATE Test.TestTran SET Col1 = 2 WHERE Col1 = 1; /* This statement is now blocked by connection 1 because it would cause the transaction in connection 1 to experience a non-repeatable read. */

Configured a Microsoft Windows Server 2003 R2 computer with Microsoft SQL Server 2005 Enterprise Edition SP1 as detailed in the Appendix. Installed an updated copy of the AdventureWorks sample database as detailed in the Appendix.

Consider the following authentication guidelines when integrating SQL Server with high-availability solutions.

SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Still returns 2 rows, i.e. a non-repeatable read did not occur. */

When you install a SQL Server 2005 failover cluster, keep in mind the following secu rity rules that can affect the installation:

The account used to start SQL Server in the cluster must be a domain account. You should not change the passwords for any of the SQL Server service accounts when a failover cluster node is disabled. However, if you need to change pass words, ensure that you reset the password by using SQL Server Configuration Manager when all nodes are online again.

/* Abort the above query and execute the following insert statement. */ INSERT Test.TestTran (Col1, Col2) VALUES (1, 3); /* This statement is also blocked, exactly as the update was, because it would cause the transaction in connection 1 to experience a phantom read. */

The first step to take in protecting a SQL Server 2005 installation is to closely examine the physical environment that will house this important piece of organizational infrastructure. This step boils down to answering the question, How much effort would it take for anyone in the office to place his or her hand on the server Auditing the existing infrastructure also means knowing exactly which service packs, updates, and hotfixes have been applied to a computer, and which service packs, updates, and hotfixes have yet to be applied because they have not yet passed through the organization s update management cycle.

3

SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Still returns 2 rows, i.e. a phantom read did not occur. */

If the service account for SQL Server is not an administrator account in the clus ter, the administrative shares cannot be deleted on any node of the cluster. The administrative shares must be available in a cluster for SQL Server to function. On Microsoft Windows Server 2003 based clusters, you can use Kerberos authentication against SQL Server 2005 virtual servers.

Database replication relies on user authentication to control access to the objects, servers, and agents involved in the replication. Keep in mind the following security concepts when configuring authentication for replication:

/* Abort the above query and execute the following insert statement. */ INSERT Test.TestTran (Col1, Col2) VALUES (2, 1); /* This statement is also blocked, exactly as the previous insert was. This happened even though the row inserted by this statement would not be included in the query in connection 1. This in turn is because SQL Server found no index to lock a range in, so it locked the entire table. */

After this lesson, you will be able to:

Run each replication agent under a different Windows account, and use Windows authentication for all replication agent connections. Add a local Windows account, which is not a domain account, for each agent on the appropriate nodes. You should use the same user name and password on each node. Ensure that an agent runs under the same account on each computer. If you change the password for an account used by a replication agent, you need to execute the stored procedure sp_changereplicationserverpasswords to change the passwords on all replication servers.

For Database Mirroring, you can configure either Windows authentication or certifi cate-based authentication. The form of authentication used for Database Mirroring is a property of its Database Mirroring endpoint. The following are the possible scenar ios that affect the implementation of Database Mirroring:

COMMIT TRAN;