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15.4 Custom collection sets
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You can define additional collection sets that draw information from a number of different sources, using one of three collector types: T-SQL Query, SQL Trace, and Performance Counter. A fourth collector type, Query Activity, collects the same information as the Query Statistics system collection set. Creating custom collection sets requires the use of a number of stored procedures including sp_syscollector_create_collection_set and sp_syscollector_create_collection
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_item. Unfortunately, you cannot create custom collection sets using the Management Studio interface. However, once they are created, you can manage their upload configuration and schedule using Management Studio as with the system collection sets. You can create custom collection sets for a variety of purposes, including the following: Longer-term storage of DMVs such as the missing index DMVs. As we covered in chapter 13, these DMVs are limited to the last 500 missing indexes reported by the query optimizer, so storing a regular snapshot of these DMVs in the MDW can overcome this limitation. Creating a customized compliance solution with policy-based management, for example, uploading the results of policy checks from multiple servers to the central MDW for a centralized compliance-reporting solution. Collecting customized Performance Monitor counters as part of a broader baseline. Despite the Server Activity system collection set including a number of performance counters, additional counters not included in this set may be required. A full description of the process and procedures for creating a custom collection set is found in SQL Server Books Online. A brief example in listing 15.1 demonstrates the TSQL code for creating a custom set called Performance Baseline, which includes a number of performance counters.
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Listing 15.1 Creating a custom collection set for performance counters
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-- Create a Custom Collection Set containing three Performance Counters use msdb; declare @collection_set_id_1 int declare @collection_set_uid_2 uniqueidentifier exec [dbo].[sp_syscollector_create_collection_set] @name=N'Performance Baseline' , @collection_mode=0 , @description=N'Custom Performance Counters' , @target=N'' , @logging_level=0 , @days_until_expiration=5 , @proxy_name=N'' , @schedule_name=N'CollectorSchedule_Every_5min' , @collection_set_id=@collection_set_id_1 OUTPUT , @collection_set_uid=@collection_set_uid_2 OUTPUT declare @collector_type_uid_3 uniqueidentifier select @collector_type_uid_3 = collector_type_uid from [dbo].[syscollector_collector_types] Where name = N'Performance Counters Collector Type' declare @collection_item_id_4 int exec [dbo].[sp_syscollector_create_collection_item] @name=N'PerfCounters' , @parameters=
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'<ns:PerformanceCountersCollector xmlns:ns="DataCollectorType">
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<PerformanceCounters Objects="$(INSTANCE):Buffer Manager" Counters="Page life expectancy" /> <PerformanceCounters Objects="$(INSTANCE):General Statistics" Counters="User Connections" /> <PerformanceCounters Objects="LogicalDisk" Counters="Avg. Disk sec/Read" Instances="*" />
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</ns:PerformanceCountersCollector>' , @collection_item_id=@collection_item_id_4 OUTPUT , @frequency=5 , @collection_set_id=@collection_set_id_1 , @collector_type_uid=@collector_type_uid_3
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Once the custom set is created using the code in listing 15.1, it will appear in Management Studio as a new collection set, at which point you can configure its upload settings in the same manner as we covered earlier for system data collection sets. Finally, the benefit of collecting and uploading data is, of course, to enable reporting on it, and in that regard a number of powerful reports are included to work with the system collection sets.
15.5 Reporting
In closing our coverage of the data collection platform, let s take a look at the standard reports. Each of these can be accessed in SQL Server Management Studio by right-clicking Data Collection and choosing Reports > Management Data Warehouse. The data shown in the resultant report will be filtered for the server from which the report was run. Let s start with the Disk Usage Summary report.
15.5.1 Disk Usage Summary
The initial view of the Disk Usage Summary report, as shown in figure 15.9, presents a view of each database s disk usage within the instance.
Figure 15.9 The Disk Usage report includes trend lines and average growth per day for both data and log files.
Reporting
Figure 15.10 Drilling down from the Disk Usage report provides further detail on disk usage, in this case, for the data file of the AdventureWorks2008 database.
The value of this report is enhanced through the ability to click on the blue trend lines to drill down into more detail. For example, clicking on the AdventureWorks2008 database trend line opens another report, as shown in figure 15.10. The clear visibility of historical disk usage enabled by the Disk Usage reports makes capacity planning in SQL Server 2008 much simpler than in SQL Server 2005 and earlier, which required a custom process and/or a third-party product. Next up, let s examine the Query Statistics History report.
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