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Figure 15.7 SQL Server Agent jobs are used to execute the collection and upload steps of each collection set. You can rename the jobs for easier identification.
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for the upload. In contrast, a non-cached collection set will have a single job for both collection and upload. The names given to the SQL Server Agent jobs are based on their collection set number, as shown in figure 15.7. The jobs can be renamed in order to easily identify the correlation between a SQL Server Agent job and the collection set it s servicing. For example, the collection_set_2_collection/upload jobs can be renamed to Server Activity Collection and Server Activity Upload. Before changing the collection mode and/or collection and upload schedules, make sure you understand the performance impacts of doing so, particularly in a production environment with a large number of servers uploading to a central MDW database. The reporting benefits of scheduling frequent uploads need to be balanced against the performance impact on the MDW server that the data is being loaded to. Staggering the uploads can certainly help in reducing the load impact on the MDW database. In addition to the upload mode and schedule for each instance, another important consideration is the backup of the MDW database.
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15.3.2 Backup considerations
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In a production environment using the data collection platform, there are a number of additional backup considerations, summarized as follows:
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MDW database Depending on the collection sets and upload frequency, the MDW database can expect to receive approximately 300MB of uploaded data per
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server per day. It s easy to see how this database can grow very rapidly. Therefore, you need to carefully consider doing backups and monitoring disk space on the MDW server as well as archiving, which we ll cover shortly. MDW recovery model By default, the MDW database is created with the simple recovery model. In a production environment, you need to change this to the full recovery model, unless you can accept the possibility of losing data collected since the last full backup. MSDB database Each uploading instance s collection sets, upload schedules, and log histories are defined and stored in the MSDB database of each instance. Regardless of whether the data collection platform is used, this database should be backed up; however, with an active collection configuration, the need to back up this database becomes even more important.
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Data Collector and MDW
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To assist with containing the growth of the MDW database, each collection set is defined with a retention period, which we ll discuss next.
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15.3.3 Retention period
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As we ve just discussed, the MDW database will grow by approximately 300MB per server per day. This obviously makes containing the growth of this database very important, particularly in a large enterprise environment with a central MDW database and many uploading servers. Fortunately, as we saw in figure 15.5, each collection set is defined with a retention period, specified as a number of days. When the data collection upload job executes, previous data from the collection set that s older than the retention period is removed from the database. It follows that for a given number of uploading servers, the MDW database will grow to a certain size and then stabilize. The retention period of each collection set should be based on a number of factors such as the reporting requirements and available disk space. Typically, things don t always run according to plan, with a variety of potential problems preventing the successful collection and upload of a collection set s data. Fortunately, the logging component allows you to inspect the history and detail of each set s activity.
15.3.4 Logging
Right-clicking a collection set (or data collection) and selecting View Logs brings up the Log File Viewer, which, as shown in figure 15.8, presents a detailed history of the collection and upload process. As mentioned earlier, in addition to the default system data collection sets, you can create custom collection sets.
Figure 15.8 Selecting View Logs after right-clicking a collection set allows the detailed inspection of recent collection and upload activities.
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