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Data Collector and MDW
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In this chapter, we ll cover
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Data collection overview Setup and configuration Data collection Reporting
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Automating and scheduling the collection, storage, and archival of SQL Server performance and management information is a task that most DBAs recognize as being of value, particularly for baseline analysis purposes. Until SQL Server 2008, such a task required third-party products or a custom-developed process. As a result, its implementation was often avoided, delayed, or half-baked. Fortunately, Microsoft recognized the value of such a process and included an out-of-the-box, customizable data collection process in SQL Server 2008. Commonly referred to as the Data Collector, it comprises a number of key components, all of which work together to provide automated data collection and management services for participating server instances. We ll begin this chapter with a general overview of the data collection platform before looking at the setup and initial configuration process. We ll then move on to cover the Data Collector configuration process and look at some
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Component overview
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important considerations for using a centralized management data warehouse (MDW). We ll conclude the chapter with the major benefit of the data collection platform, reporting against the collected data.
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15.1 Component overview
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The data collection platform comprises three key components: the Data Collector, collection sets, and the management data warehouse. These components work together to enable information to be automatically collected and stored for later analysis and reporting. Before we focus on the setup, administration, and benefits of this platform, let s walk through an overview of the key components.
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15.1.1 Data Collector
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The Data Collector component controls the collection and upload of information from a SQL Server instance to the management data warehouse using a combination of SQL Server Agent jobs and SQL Server Integration Services (SSIS) packages. The information collected is defined in the data collection sets.
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15.1.2 Data collection sets
A data collection set is comprised of information relating to a particular aspect of a SQL Server instance. Three system data collection sets are included with SQL Server 2008: Disk Usage, Query Statistics, and Server Activity. DISK USAGE This collection set records disk usage statistics for each database on the instance where the data collection set is located. By collecting this information on a regular basis, you can report on information such as the average data file growth per day. QUERY STATISTICS One of the limitations of DMVs such as sys.dm_exec_query_stats is that the information they contain is lost each time SQL Server restarts. The Query Statistics collection set overcomes this limitation by regularly collecting and storing this information, enabling retrospective analysis of query information such as Top N queries by CPU from any period of time in which the collection data is available. SERVER ACTIVITY In the previous chapter we spoke about setting up Performance Monitor to record counters to log files for later analysis. When enabled, this collection set does that for us automatically, enabling reporting on counter values across periods of the collected data so that we can easily compare current performance to previous points. In addition to these system collection sets, we can define custom collection sets, an example of which we ll cover a little later. The data collected by the collection sets is uploaded by the Data Collector component to the management data warehouse.
15.1.3 Management data warehouse
When created by the setup wizard, the management data warehouse, commonly known as the MDW, is created with all of the necessary data structures to store uploaded data
362 Server A
Data Collector and MDW
Collection sets: disk usage, query statistics, server activity Data collector Collection sets: disk usage, query statistics, server activity Data collector
Hourly on the hour
Server B
Hourly on the 3/4 hour
Reports
Server C
Collection sets: disk usage, query statistics, server activity Data collector
Hourly on the 1/2 hour
Central MDW server
Figure 15.1 An example data collection architecture that uses a dedicated, centralized MDW server to which multiple servers upload their collected data
from the data collection sets of participating servers. Each server is individually configured for data collection, and one of the steps in this process is choosing the MDW location where the collected data will be loaded. Once the data collection sets begin loading, the MDW becomes the source for a number of included (and very powerful) reports, which we ll cover shortly. Figure 15.1 shows the major components of the data collection platform working together. With this overview in mind, let s proceed by looking at the initial setup and configuration steps.
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