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In the previous plan guide creation script, we created a plan by passing the SQL statement and optimization options directly to the sp_create_plan_guide statement. Alternatively, you can create plan guides using XML Showplan data. Consider the following example: DECLARE @xml_showplan NVARCHAR(max); SET @xml_showplan = (SELECT query_plan FROM sys.dm_exec_query_stats AS qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st CROSS APPLY sys.dm_exec_text_query_plan(qs.plan_handle, DEFAULT, DEFAULT) AS qp WHERE st.text LIKE N'SELECT emp.Title,c.FirstName,c.LastName FROM HumanResources.Employee emp JOIN Person.Contact c ON emp.ContactID=c.ContactID') EXEC sp_create_plan_guide @name = N'Guide1_from_XML_showplan', @stmt = N'SELECT emp.Title,c.FirstName,c.LastName FROM HumanResources.Employee emp JOIN Person.Contact c ON emp.ContactID=c.ContactID;', @type = N'SQL', @module_or_batch = NULL, @params = NULL, @hints =@xml_showplan; This script obtained the XML Showplan data for the given query and used it to define the hint in the query plan. In all the examples we have discussed up until now, we have created the plan by passing the actual SQL statement and optimization information. Sometimes, this capability is satisfactory; however, if you already have a lot of tuned queries in your query cache, it is not easy to script or generate a plan based on these queries. SQL Server 2008 introduces the sp_create_plan_from_cache statement, which allows you to create plan guides directly from queries stored in cache.

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In the beginning of this section, we discussed a couple scenarios of where using plan guides could be beneficial. Another possibility is to use plan guides as a backup in case your queries start to perform more poorly than expected. In that case, you can follow this game plan: Identify mission-critical queries. Although it is possible to tune almost every query, it is best to pick those that are frequently used or that take a long time to run. This information can be obtained easily by configuring traces in Profiler. Tune queries. Entire books are devoted to this subject. You can start with examining the execution plan and seeing if there are any red flags, such as the query is issuing table scans, column statistics for tables in the query are missing, and so on. Clear the query cache. Issuing a DBCC FREEPROCCACHE statement will clear all the queries in the plan cache. This statement also has the ability to selectively clear plans and even to clear all plans in a given resource pool. For more information about resource pools, see the Resource Governor section earlier in this chapter. Run queries. Executing queries will cause query plans to be generated, provided those plans do not already exist. Create plan guides using the sp_create_plan_guide_from_cache statement. Disable all the generated plan guides using the sp_control_plan_guide statement.

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## Generate all the random numbers random -r -l 1 -u $sides -n $(( $num * 2 )) ## Place numbers in the positional parameters set -- $_RANDOM while [ $# -gt 0 ] do printf "%s$sep" $(( $1 + $2 )) shift 2 done

Note If you want to grant a user access to any resources, pass a null to the resource argument in the allow method. I did this for the administrators.

At this point, the plans of your optimized queries are stored. If there are performance issues in the future, you can enable these plans using the sp_control_plan_guide statement.

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On paper, the procedure outlined in the previous section will work great, and you can enable your saved plan guides with sp_control_plan_guide However, occasionally, over time, small changes occur in the database that render these plans invalid Reasons for invalid plans vary but commonly are due to missing indexes or changes to the physical design of the objects your queries are leveraging To check the validity of a plan guide, you can use the sysfn_validate_plan_guide function If you want to take a more proactive stance on invalid plan guides, you can monitor two new event classes using Profiler or any other tool that listens to trace events: The Plan Guide Successful event is raised when the database engine successfully produces an execution plan for a query or batch that contains a plan guide.

Summary

The Plan Guide Unsuccessful event fires when an execution plan was compiled without using a plan guide When this event occurs, a call to sysfn_validate_plan_guide might determine the cause of the issue To monitor plan guide usage, you can use two new performance counters, which are both part of the SQL Server:SQL Statistics performance object: The Guided plan executions/sec counter reveals the number of plan executions per second in which the query plan has been generated by using a plan guide The Misguided plan executions/sec counter indicates when the execution plan had to be compiled because the database engine could not use the plan guide that was defined for the query or batch Monitoring these performance counters over time can indicate gradual performance trends due to issues with valid plan guides Up until now, we have shown how to use T-SQL to manage plan guides.

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