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Lesson Summary
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SQL Server Profiler provides a graphical interface to the SQL Trace API that enables you to capture data for events within SQL Server. You can then analyze the trace data to determine causes of performance degradation, blocking, deadlocking, or other error events. The first step in using Profiler to capture data is to define a trace by selecting the events and data columns to capture, choosing any filters you want to enable, and deciding whether you want to save the trace data to a file or table or just display it in Profiler. You can start, pause, and stop Profiler traces via buttons on the Profiler toolbar. To gather even more complete information about queries that SQL Server is running, you can specify in Profiler that the trace gather showplan information about the query execution plans SQL Server is using. You can also create a replay trace to generate a workload that you can replay on a test system.
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Lesson Review
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The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
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NOTE
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Answers
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
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1. Which types of events can you trace by using SQL Server Profiler (Choose all that apply.) A. CPU utilization B. Statements executed within stored procedures C. Network input/output (I/O) D. Stored procedure recompiles
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Lesson 1: Working with SQL Server Profiler
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2. To which formats can you save a trace (Choose all that apply.) A. Binary file B. Text file C. SQL Server table D. Comma-delimited file 3. Which of the following are valid configuration options (Choose all that apply.) A. Trace category B. Enable file rollover C. Restriction on resources used D. Event filters
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15
Monitoring and Troubleshooting SQL Server Performance
Lesson 2: Working with System Monitor
System Monitor is the second tool that you can use to gather monitoring data about conditions that might affect database performance. Included with Windows, System Monitor captures counters across a variety of system metrics as well as for any application that you define a set of custom counters for. This lesson explains how to create a System Monitor counter log that you can use to correlate Profiler data with system metrics that Profiler cannot capture. By correlating this data, you can gain a more complete picture of your system s health than either Profiler or System Monitor can provide on its own.
Exam Tip Although System Monitor is the formal name for this tool, virtually everyone in the industry calls it Performance Monitor, or PerfMon for short, because it is used to capture performance counters and you launch it from the Administrative Tools section called Performance. Just remember that on the exam, this tool is always referred to by its formal name of System Monitor. But out in the field, most people call it PerfMon.
After this lesson, you will be able to:
Configure a System Monitor counter log.
Estimated lesson time: 20 minutes
Real World
Michael Hotek When performance decreases, the database is always the first to receive blame. Thus, the DBA receives the first calls from irate users. One of the first things I do when investigating a performance issue is connect to the SQL Server and look at the results of the sp_who2 system stored procedure. This stored procedure gives me a basic idea of whether I have a bunch of queries blocking each other and bringing the system to a halt. At one customer site, I went through this process and didn t see any real issues. The customer had a large number of connections, but requests were being processed very quickly. So, the next step was to open Profiler and run a basic trace to get an idea of the activity on the system and how long most queries were taking.
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