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You can choose not to create traces by using Profiler, but instead use Transact-SQL stored procedures from within your own applications to create traces manually on an instance of the SQL Server database engine. This approach allows you to write custom applications specific to the needs of your enterprise. SQL Trace gathers events that are instances of event classes listed in the trace definition. These events can be filtered out of the trace or queued for their destination. The destination can be a file or SQL Server Management Objects (SMOs), which can use the trace information in applications that manage SQL Server. An Event Source is any source that produces the trace event (for example, TransactSQL batches) or SQL Server events (for example, deadlocks). If you include the event class in a trace definition, the event information is gathered by the trace after an event occurs. Predefined filters are applied, and the trace event information is passed to a queue. You can use the following Transact-SQL system stored procedures and functions to create and run traces and to trace an instance of the SQL Server database engine:

To further practice and reinforce the skills you learned in this chapter, you can per form the following tasks:

INSERT Test.Testtran (Col1, Col2) VALUES (1, 2);

Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenario. This scenario sets up a real-world situation involv ing the topics of this chapter and asks you to create solutions. Complete the suggested practices. Take a practice test.

SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Still returns the 1 row with the value 1 for the Col2 column. */

Summary

Creates a trace Applies a new or modified filter to a trace Creates a user-defined event Returns information about events included in a trace

Endpoints provide the first layer of security within SQL Server. By providing a barrier that is similar to a firewall, endpoints ensure that only valid connections with valid traffic can gain access to your SQL Server instance. Endpoints can be created for either TCP or HTTP protocols. TCP endpoints can have payloads for TSQL, DATABASE_MIRRORING, or SERVICE_BROKER. HTTP endpoints can have a payload of SOAP. HTTP endpoints enable stored procedures and functions to be exposed and con sumed as a Web service, in effect enabling your SQL Server to act as a registered Web service.

UPDATE Test.TestTran SET Col2 = 10 WHERE Col1 = 1; /* Sets the Col2 column of both rows to the value 10. */ SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Returns 2 rows with the value 10 for the Col2 column in both rows. */

Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.

HTTP endpoint Simple Object Access Protocol (SOAP) TCP endpoint Web service Web Services Description Language (WSDL)

SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Still returns the 1 row with the value 1 for the Col2 column. */

sp_trace_setevent Adds or removes event classes sp_trace_setfilter sp_trace_setstatus Starts, stops, and closes the trace sp_trace_generateevent fn_trace_geteventinfo fn_trace_getinfo

In the following case scenario, you will apply what you ve learned about designing SQL Server endpoints. You can find answers to the questions in the Answers section at the end of this book.

UPDATE currRow SET Col2 = snapshotRow.Col2 + 1 FROM Test.TestTran AS currRow WITH(READCOMMITTED) INNER JOIN Test.TestTran AS snapshotRow ON snapshotRow.PKCol = currRow.PKCol; /* This update is now executed in read committed isolation (because of the locking hint) but reads the data from the snapshot isolation. This causes the data to be overwritten without an update conflict being issued. If the transaction in connection 2 was still open, this query would have been blocked until it finished. But when it is no longer blocked, it will just overwrite whatever data had been put in the row by the other transaction. */