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Using the Usage-Based Optimization Wizard
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You can design aggregations using the Aggregation Design Wizard or the Usage-Based Optimization Wizard . The main difference between the two wizards is that the Aggregation Design Wizard considers all queries equally likely, whereas the Usage-Based Optimization Wizard creates aggregations designed to optimize performance based on queries selected from a log . The best strategy is to design aggregations during development with the Aggregation Design Wizard using estimated long-term counts and a low performance gain (20 30%) . Then, if you need to improve query performance, log the queries that your users execute and use the Usage-Based Optimization Wizard to design aggregations that can be used to supplement or replace the aggregations designed with the Aggregation Design Wizard . Before you can use the Usage-Based Optimization Wizard, you must enable Analysis Services query logging . You use SQL Server Management Studio (SSMS) to configure the connection to the SQL Server database containing the table that will hold the log records . You will also need to configure the proportion of queries that are logged . After you have enabled query logging, you need to allow sufficient time for users to execute queries . When a representative sample of queries has been logged, you can then use the Usage-Based Optimization Wizard to design aggregations . The Usage-Based Optimization Wizard will allow you to
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specify which logged queries you want it to use to design aggregations . You can select queries that were executed during a date range, executed by specific users, most frequently executed, or took a long time to execute . The wizard will design aggregations that optimize the performance of these queries . You can then add these aggregations to an existing aggregation design or create a new aggregation design .
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In this procedure, you will enable Analysis Services query logging using SSMS . 1. On the Microsoft Windows task bar, click Start, point to All Programs, expand the Microsoft SQL Server 2008 folder, and then select SQL Server Management Studio . 2. In the Connect to Server dialog box, select Analysis Services from the Server Type list, type localhost in the Server Name text box, and click Connect . 3. In Object Explorer, right-click Localhost and select Properties . 4. In the Analysis Server Properties dialog box on the General page, locate the Log \ QueryLog \ QueryLogConnectionString property, click the cell in the Value column, and then click the button that appears in the cell .
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You can use the Connection Manager dialog box to specify the SQL Server database that will contain the query log table . For the sake of convenience, you will create the query log table in the SSAS2008SBS database, the same database that contains the source data . As a best practice, you will want to store this table in a separate database that is dedicated for administrative use .
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5. In the Connection Manager dialog box, enter localhost in the Server Name text box and select SSAS2008SBS from the Select Or Enter a Database Name list . Click OK . The query log table will have to have a name . By default, the table is named OlapQueryLog . You can change this name if you wish, but for now accept the default value . 6. Verify that the Value column of the Log \ QueryLog \ QueryLogTableName property contains OlapQueryLog . You can create the query log table or use an existing table, but it is easier to let SSMS create the table for you . 7. Change the Value column of the Log \ QueryLog \ CreateQueryLogTable property to True . The table will be created at the end of this procedure when you click OK and close the Analysis Services Properties dialog box . Finally, you need to configure the proportion of queries that will be logged . By default, Analysis Services logs one of every ten queries . 8. Change the Value column of the Log \ QueryLog \ QueryLogSampling from 10 to 1 . A value of 1 will cause Analysis Services to log every query . Generally, this sampling frequency would be excessive, but in the next procedure, you will want to populate the query log quickly so that you can use the Usage-Based Optimization Wizard . The values of the Log \ Query Log properties should now be configured to enable query logging .
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9. Click OK . Important Be sure to reset the value of the Log \ QueryLog \ QueryLogSampling property to a more suitable value, such as the default value of 10, if you plan on using this optimization technique on your own databases . You can disable query logging by setting the value to zero . Now that query logging is enabled, you can browse the cube and Analysis Services will create query log entries .
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