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We ve already looked at some of the information available from Microsoft on the Internet. In addition to those sites, a wealth of information is available on the Internet. In this section, I ll point you to some useful websites and other online resources.

START TRANSACTION ISOLATION LEVEL READ UNCOMMITTED; SELECT * FROM ARTISTS; COMMIT;

In addition to the Microsoft resources covered earlier, several excellent websites are available for finding Windows NT/2000, SQL Server, and industry-related websites. Websites can provide the most up-to-date information on news and are easily accessible. However, you should always consider the source of technical information and try to verify information before you depend on it. Table A-2 lists some of these resources, and Figure A-6 shows a useful SQL Server 7 website.

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set the isolation level. But this time you ll be setting the level to SERIALIZABLE. Because SERIALIZABLE is the default, you aren t required to define it; however, for the purposes of this exercise, we re going to include it. After you start the transaction, you ll attempt to update the COMPACT_DISCS table by increasing the IN_STOCK value by 2 for all rows with a LABEL_ID value equal to 832. After the UPDATE statement, you ll roll back the transaction so that no data is modified in the database. Enter and execute the following SQL transaction:

Figure 9-2

START TRANSACTION ISOLATION LEVEL SERIALIZABLE; UPDATE COMPACT_DISCS SET IN_STOCK = IN_STOCK + 2 WHERE LABEL_ID = 832; ROLLBACK;

Certification Microsoft Certified Professional (MCP) Microsoft Certified Professional + Internet (MCP + Internet) Microsoft Certified Systems Engineer (MCSE) Microsoft Certified Systems Engineer + Internet (MCSE + I)

back. Enter and execute the following SQL statement:

phone numbers that need to be updated The sequence of events (all happening within seconds of each other), as illustrated in Figure 9-2, takes place as follows: 1 User A selects the data from Customer 1 and applies an update to debit the balance due No commit is issued yet because this is only part of the transaction that must take place The row for Customer 1 now has a lock on it due to the update 2 The statement submitted by User B updates the phone number for Customer 2 The entire SQL statement must run as a single transaction, so there is no commit at this point, and thus User B holds a lock on the row for Customer 2 3 User A selects the balance for Customer 2 and then submits an update to credit the balance due (same amount as debited from Customer 1).

SELECT CD_TITLE, IN_STOCK FROM COMPACT_DISCS WHERE LABEL_ID = 832;

Target Professionals IT professionals with expertise in at least one Microsoft product MCPs who have additional experience in implementing Microsoft s Internet technologies IT professionals who plan for, implement, and manage Windows NT/2000 and BackOffice products IT professionals who have passed the requirements for the MCSE exam and have additional experience working with Internet technologies Developers and administrators of SQL Server 7 Software developers who use Microsoft products for planning and implementing business solutions

The SELECT statement should return the following query results:

CD_TITLE ---------------------------That Christmas Feeling Patsy Cline 12 Greatest Hits Out of Africa Blues on the Bayou IN_STOCK -------8 32 29 27

Microsoft Certified Database Administrator (MCDBA) Microsoft Certified Solutions Developer (MCSD)

The request must wait because User B holds a lock on the row to be updated 4 The statement submitted by User B now attempts to update the phone number for Customer 1 The update must wait because User A holds a lock on the row to be updated These two database sessions are now in deadlock User A cannot continue due to a lock held by User B, and vice versa In theory, these two database sessions will be stalled forever Fortunately, modern DBMSs contain provisions to handle this situation One method is to prevent deadlocks Few DBMSs have this capability due to the considerable overhead this approach requires and the virtual impossibility of predicting what an interactive database user will do next.

The IN_STOCK values shown in these results are what were contained in the COMPACT_ DISCS table before you executed the transaction. If the transaction had not been rolled back, each of these values would have been increased by 2.

Table A-1.

(continued)

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