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differential backup A type of backup where only the extents that have changed since differential base A set of files or filegroups that form a differential backup. dirty data Data that contains inaccuracies because of misspellings, truncations, missing

4

CREATE TABLE Test.CoveredIndexTest ( Col1 INT NOT NULL Col2 NVARCHAR(2047) NOT NULL ); INSERT Test.CoveredIndexTest (Col1, Col2) VALUES (0, 'A lonely row...'); INSERT Test.CoveredIndexTest (Col1, Col2) SELECT TOP(999999) message_id, text FROM sys.messages AS sm CROSS JOIN ( SELECT TOP(15) 1 AS Col FROM sys.messages ) AS x

In this exercise, you create a new login in SSMS. 1. Open SSMS. When prompted, click Connect to log on to your server with Windows Authentication. 2. In the console tree, expand the Security folder. 3. Create a new login by right-clicking the Logins folder and choosing New Login. 4. In the Login New window, select SQL Server Authentication. 5. In the Login Name text box, type TestUser. 6. Leave the Password and Confirm Password text boxes blank and then click OK. An error message appears, indicating that the password is too short. 7. Click OK to dismiss the error message. 8. In the Login New window, clear the Enforce Password Policy check box. 9. Click OK. 10. A message box appears, asking you to confirm the creation of a login with a blank password. 11. Click Yes. 12. In SSMS, click Connect and then select Database Engine from the drop-down menu. 13. Connect to DBSRV1 by means of the TestUser login. Remember to select SQL Server Authentication. 14. After you verify that you can connect with a blank password, right-click the new DBSRV1 icon in the console tree (corresponding to the TestUser login) and then choose Disconnect.

On the test machine, the size of this table is 24,238 pages (roughly 193 MB); also note that the table is a heap, that is, it does not have a clustered index defined on it. The queries and indexes used in this test have the following definitions; the performance metrics (measured in page reads) for the queries are shown in Table 7-4.

In this exercise, you change the properties of the new login you have just created to enforce password policy. 1. In SMSS, click New Query. 2. In the Query pane, enter the following code:

A function used by Fuzzy Lookup and Fuzzy Grouping that takes account of the edit distance, the number of tokens, the token order, and relative frequencies.

ALTER LOGIN TestUser WITH PASSWORD ='Pa$$w0rd' MUST_CHANGE,

-- Query #1 -- Returns 1 row. SELECT Col1, Col2 FROM Test.CoveredIndexTest WHERE Col1 = 0; -- Query #2 -- Returns roughly 0.1% of the rows found in the table. -- (1,056 rows) SELECT Col1, Col2 FROM Test.CoveredIndexTest WHERE Col1 BETWEEN 1205 AND 1225; -- Query #3 -- Returns roughly 0.5% of the rows found in the table. -- (5,016 rows) SELECT Col1, Col2 FROM Test.CoveredIndexTest WHERE Col1 BETWEEN 1205 AND 1426; -- Query #4 (non-selective) -- Returns roughly 5% of the rows found in the table. -- (50,028 rows) SELECT Col1, Col2 FROM Test.CoveredIndexTest WHERE Col1 BETWEEN 1205 AND 2298; -- Non-covered index CREATE NONCLUSTERED INDEX NonCovered ON Test.CoveredIndexTest (Col1); -- Covered index CREATE NONCLUSTERED INDEX Covered ON Test.CoveredIndexTest (Col1) INCLUDE (Col2);

CHECK_POLICY = ON,

3. In SSMS, click Execute. 4. Click Connect and then select Database Engine from the drop-down menu. 5. Attempt to connect to DBSRV1 by means of the login TestUser. Remember again to select SQL Server Authentication, and specify a password of Pa$$w0rd . You will be prompted to enter a new password. 6. Enter a new password, such as Pa$$w0rd1, in the New Password and Confirm Password text boxes. 7. Click OK.

Table 7-4

A database instance that acts as a store for replication-specific data associated with one or more Publishers. Each Publisher is associated with a single database (known as a distribution database) at the Distributor.