TAILIEUCHUNG - Microsoft SQL Server 2008 R2 Unleashed- P19

Microsoft SQL Server 2008 R2 Unleashed- P19:SQL Server 2005 provided a number of significant new features and enhancements over what was available in SQL Server 2000. This is not too surprising considering there was a five-year gap between these major SQL Server 2008 is not as much of a quantum leap forward from SQL Server 2005 | 134 CHAPTER 6 SQL Server Profiler size helps make the file more manageable and more importantly it can save you from having a trace file gobble up all the disk space on the drive you are writing to. Remember that the amount of trace data written to a file on a busy production system can be extensive. You can also use this file size option in conjunction with the Enable File Rollover option. When the Enable File Rollover option is used the trace does not stop when the file size maximum is met. Instead a new trace file is created and the output is generated to that file until it reaches the file size maximum. Saving Trace Output to a Table The Save to Table option writes the trace output directly to a SQL Server table as the trace is running. Having the data in a SQL table provides a great deal of flexibility for analyzing the data. You can use the full power of Transact-SQL against the table including sorting grouping and more complex search conditions that are not available through the SQL Profiler filters. You need to consider both the disk space requirements and impact on performance when the Save to Table option is used. The Profiler provides an option Set Maximum Rows in Thousands to limit the amount of output generated from the trace. The performance impact depends on the volume of data being written to the table. Generally you should avoid writing the trace output to a table when using high-volume SQL servers. The best option for high-volume servers is to first write the trace output to a file and then import the file to a trace table at a later time. Saving the Profiler GUI Output Another option for saving trace output occurs after trace output has been generated to the Profiler GUI and the trace has been stopped. Similar to the save options for an executing trace the GUI output can be saved to a file or table. You access the options to save the GUI output by selecting File Save As. The Trace File and Trace Table options are used to save to a file or table .

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