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WHILE 1=1 BEGIN BEGIN TRAN UPDATE Purchasing.Vendor SET CreditRating = 2 WHERE VendorID = 1 UPDATE Purchasing.Vendor SET CreditRating = 1 WHERE VendorID = 2 COMMIT TRAN END After a few seconds, check each query editor window until the following error message appears on one of the query editors: Msg 1205, Level 13, State 51, Line 9 Transaction (Process ID 53) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction. Looking at the SQL Log in SQL Server Management Studio, the deadlock event was not logged. A third query editor window is opened and the following command is executed: DBCC TRACEON (1222, -1) GO DBCC TRACESTATUS DBCC TRACESTATUS shows the active traces running for both the local session and globally: DBCC execution completed. If DBCC printed error messages, contact your system administrator. TraceFlag Global Session --------- ------ ------1222 1 0 (1 row(s) affected) DBCC execution completed. If DBCC printed error messages, contact your system administrator. To simulate another deadlock, the winning connection query (the one that wasn t killed in the deadlock) is restarted, and then the deadlock losing session is restarted, causing another deadlock after a few seconds. After the deadlock has occurred, stop the other executing query. Now the SQL log in SQL Server Management Studio contains a detailed error message from the deadlock event, including the database and object involved, the lock mode, and the Transact-SQL statements involved in the deadlock. For example, when deadlocks occur, you ll want to make sure to find out the queries that are involved in the deadlock, so you can troubleshoot them accordingly. The following excerpt from the log shows a deadlocked query:

07/28/2005 20:20:00,spid20s,Unknown, UPDATE [Purchasing].[Vendor] set [CreditRating] = @1 WHERE [VendorID]=@2 From this we can tell which query was involved in the deadlocking, which is often enough to get started with a solution. Other important information you can retrieve by using trace 1222 includes the login name of the deadlocked process, the client application used to submit the query, and the isolation level used for its connection (letting you know if that connection is using an isolation level that doesn t allow for much concurrency): ... clientapp=Microsoft SQL Server Management Studio Query hostname=JOEPROD hostpid=3884 loginname=JOEPROD\Owner isolationlevel=serializable (4) xactid=223338311933 currentdb=5 lockTimeout=4294967295 clientoption1=673187936 clientoption2=390200 After examining the SQL Log, disable the trace flag in the query editor: DBCC TRACEOFF (1222, -1) GO DBCC TRACESTATUS

Test coverage is the measurement of how well any given code or run of an application exercises the code that makes up the application. The next few sections provide an overview of test coverage, highlight the options provided by GCC compilers for test coverage, discuss all of the auxiliary data files produced by those options, and supply examples of using gcov to perform test coverage analysis. Before you can explore the options provided by GCC compilers for performing coverage analysis, you need an understanding of test coverage basics. In the next section, we give you an overview of the most common types of test coverage and explore situations in which tests must be cleverly constructed to augment the built-in test coverage capabilities provided by GCC compilers.

In this recipe, I simulated a deadlock using two separate queries that updated the same rows repeatedly: updating two rows in the opposite order. When a deadlock occurred, the error message was logged to the query editor window, but nothing was written to the SQL Log. To enable deadlock logging to the SQL log, the recipe enabled the trace flag 1222. Trace 1222 was introduced in SQL Server 2005 and returns detailed deadlock information to the SQL log. The -1 flag indicated that trace flag 1222 should be enabled globally for all SQL Server connections. To turn on a trace flag, DBCC TRACEON was used, with the 1222 flag in parentheses: DBCC TRACEON (1222, -1) To verify that the flag was enabled, DBCC TRACESTATUS was executed: DBCC TRACESTATUS After encountering another deadlock, the deadlock information was logged in the SQL log. The flag was then disabled using DBCC TRACEOFF: DBCC TRACEOFF (1222, -1)

A variety of different approaches to test coverage are commonly used to measure how well certain tests exercise a given application. The most common of these are the following:

You can increase a query session s chance of being chosen as a deadlock victim by using the SET DEADLOCK_PRIORITY command. The syntax for this command is as follows: SET DEADLOCK_PRIORITY { LOW | NORMAL | HIGH | <numeric-priority> } The arguments for this command are described in Table 3-12:

Statement coverage: Statement coverage measures whether each statement in an application is exercised Keep in mind that the number of statements is not necessarily directly related to the number of lines of code, since single lines of code can contain multiple statements, though putting multiple statements on a single line is poor practice from a testing (and readability) point of view Test output that lists every line of code in an application and whether it is covered can be too voluminous to manage properly For this reason, most statement coverage testing identifies test coverage in terms of basic blocks of statements that are sequential and nonbranching This statement coverage shorthand is usually referred to as basic block coverage As explained later in this chapter, GCC provides built-in support for basic block coverage reporting.