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You can add Showplan event classes to a trace definition so that Profiler gathers and displays query plan information in the trace. You can extract Showplan events from the trace by using the Events Extraction Settings tab when you are configuring the trace, by using the Extract SQL Server Events option on the Profiler File menu, or by right-clicking specific events and choosing Extract Event Data.

FOR SOAP (

SET TRANSACTION ISOLATION LEVEL READ COMMITTED;

WEBMETHOD 'BillofMaterials'

(name='AdventureWorks.dbo.uspGetBillOfMaterials'),

UPDATE Test.TestTran SET Col2 = 10 WHERE Col1 = 1;

For more information about Showplan event classes, search for Analyzing Queries with Showplan Results in SQL Server Profiler in Books Online, or access msdn2.microsoft.com/en-us/library/ ms187941(d=ide).aspx. Lesson 2 of this chapter discusses Showplan in more detail.

5

UPDATE Test.TestTran SET Col2 = Col2 + 1 WHERE Col1 = 1; /* Receives the update conflict error and the transaction is rolled back. According to the snapshot, the value of Col2 should become 2, but that would cause the transaction in connection 2 to be lost (or not durable according to ACID). */ SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Now returns the value 10 for the Col2 column because the snapshot transaction was rolled back. */

WSDL = DEFAULT,

SCHEMA = STANDARD,

You can use the DTA to analyze a workload provided by a profiler trace, or by a query or query script that you have entered in Query Editor. Typically, you run the tool on a test server that duplicates some of the information on your production server. You can use the DTA to identify inefficiently indexed queries and to identify appropriate changes. It lets you perform a what-if analysis to determine how an alternative indexing strategy might affect query performance.

-- Drop the table used in this example. DROP TABLE Test.TestTran;

DATABASE = 'AdventureWorks',

NAMESPACE = 'http://tempUri.org/'

6

CREATE ENDPOINT sql_endpoint STATE = DISABLED AS HTTP( PATH = '/sql',

2

Apparently, because of update conflicts, the snapshot isolation level is not the best choice if you are reading and later updating a specific set of rows within a transaction. It is, however, interesting to know that regardless of whether rows changed, you would not experience an update conflict if you execute an INSERT SELECT statement within the snapshot transaction. If you must issue an UPDATE or DELETE statement within a snapshot transaction, consider issuing it within a try/catch block. You can also consider switching back to the read committed isolation level before you issue the update. This will block the transaction if an open transaction has updated or deleted the rows that need to be accessed and, if the transaction is not blocked, the update will use the data from the current row version rather than the one in your snapshot. Remember that the update might experience phantom rows, so you need to specify exactly which rows to update (by referencing the primary key column in your WHERE clause). You can also combine the two isolation levels by reading from the snapshot isolation level and writing to the read committed isolation level. If a transaction is implemented this way, other transactions cannot be considered durable, because they can have their committed data overwritten by old data. (This is also an alternative way of interpreting the lost update concurrency problem.) Here is an example of this scary but feasible implementation. In this case, the transaction isolation level is set for the UPDATE statement using a table locking hint.

AUTHENTICATION = (INTEGRATED ),

PORTS = ( SSL ),

ALTER DATABASE <current_database> SET ALLOW_SNAPSHOT_ISOLATION ON; ALTER DATABASE <current_database> SET READ_COMMITTED_SNAPSHOT OFF; -- Table including some example rows used in this example. CREATE TABLE Test.TestTran ( PKCol INT IDENTITY(1,1) PRIMARY KEY ,Col1 INT NOT NULL ,Col2 INT NOT NULL ); INSERT Test.TestTran (Col1, Col2) VALUES (1, 1);

SITE = 'SERVER'

The DTA enables you to view the effects of a workload against single or multiple databases and makes recommendations to alter the physical design structure of your SQL Server databases. These physical structures include clustered indexes, nonclustered indexes, indexed views, and partitioning. DTA recommendations help you redesign your query environment and reduce query execution times.

FOR SOAP (

SET TRANSACTION ISOLATION LEVEL SNAPSHOT; BEGIN TRAN; SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Returns 1 row with the value 1 for the Col2 column. */

WEBMETHOD 'BillofMaterials'

SET TRANSACTION ISOLATION LEVEL READ COMMITTED;

(name='AdventureWorks.dbo.uspGetBillOfMaterials'), WSDL = DEFAULT, SCHEMA = STANDARD, DATABASE = 'AdventureWorks', NAMESPACE = 'http://tempUri.org/' );