.net qr code generator open source 6: Basic Troubleshooting in .NET

Generate QR Code 2d barcode in .NET 6: Basic Troubleshooting

CHAPTER 6: Basic Troubleshooting
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Figure 6 6. Displaying all events and all data columns
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An example of this would be to capture the RPC:CompletedEvent and SP:BatchCompleted event classes found in the Stored Procedures and TSQL event categories, respectively. Those event classes will allow for you to include data columns for the following: ApplicationName CPU Duration LoginName Reads TextData Writes Since this trace could generate a lot of results it may be worth your time to configure some filters on the data columns. You may want to consider only returning results for statements that have CPU > 500, a duration > 500, reads > 10,000, and writes > 5000, or some combination thereof. You can adjust as necessary in order to have a manageable result set. As you may have surmised by now, using SQL Profiler to troubleshoot performance issues is a lot more overhead than the other methods discussed. The use of SQL Profiler itself can in turn cause performance issues for the queries that are actively running, so use it with caution on any system in your care. It does allow for a good deal of flexibility in capturing information and when the output is stored in a database table it can allow
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CHAPTER 6: Basic Troubleshooting
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for easy filtering. Using it to isolate an issue with disk I.O, memory, or CPU is probably more overhead than necessary; it may not lead you to any conclude any one of those potential bottlenecks as your culprit. NOTE: If you store the results in a database table, you are increasing the activity on the database server. If you don t store the results, you are increasing the memory usage, which is not good if you are already having memory issues, and the increase in disk I/O if you are saving your results to the same drives that your data and log files are using. So choose how you use profiler carefully. Sylvester Carstarphen. I have often heard from other senior database administrators that SQL Profiler is not a useful tool for basic troubleshooting. It is useful, however, for those times when you need to capture all the activity (sometimes called a workload) hitting your instance. But unless you have a general idea as to where your problem lies, it can be daunting to sift through all of the activity returned. Think of a needle in a haystack and you get the idea. The Books Online do not even list troubleshooting as one of the common uses for SQL Profiler, and yet I still see many people resorting to SQL Profiler as the only tool they want to use to troubleshoot performance issues. A list of scenarios can be found at: http://msdn.microsoft.com/en-us/library/ms190793.aspx. In the end, SQL Profiler is best used when you already have a particular area to focus upon. Otherwise, you are taking a shotgun approach to troubleshooting, which can be quite time consuming.
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Disk I/O
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Unlike the tools mentioned previously, there is no direct way to use profiler to know if disk I/O is the root cause for the issue you are trying to troubleshoot. There is no event category, event class, or data column that says check here for disk I/O problems. Compare this to wait types, where you can explicitly find if a query is waiting for disk and decide for yourself which method you would prefer in the middle of the night. While it is true that you can capture the reads, writes, and duration for queries, these elements alone are not going to tell you if disk I/O is the root cause of your issue. All they can do is point you to using additional tools to take a deeper dive into the trace results. For example, you may find a query with a high duration value but very low reads and writes. You cannot conclude that you have a potential disk I/O issue because that query may have a high duration simply due to the fact that it was a being blocked by other activity.
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