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Managing Very Large Databases
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Partitions make it possible for you to create extremely large cubes. You can effectively create small, medium-sized, and even remarkably large cubes without using partitions. But partitions are useful when you need to create very large, enterprise-wide applications. For that reason, the ability to manage multiple partitions is available only with Microsoft SQL Server 2005 Enterprise Edition.
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Understanding Partition Strategies
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Each online analytical processing (OLAP) cube consists of at least one partition. You design the measures and dimensions for an entire cube, but you design storage modes and aggregations
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Part IV:
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at the partition level. Whether a cube contains only a single partition or many partitions, the process of designing storage is the same. One of the benefits of creating multiple partitions is that you can design different storage for different portions of the cube. For example, say you have one partition that contains information for the current and previous years. You access this information frequently, so you specify multidimensional OLAP (MOLAP) storage with aggregations to provide a 50% performance boost. A second partition contains values for the third, fourth, and fifth years. These years are usually accessed only at a summary level (if at all), and the relational warehouse is also occasionally accessed, so you specify hybrid OLAP (HOLAP) storage, with aggregations to the 30% performance level. A third partition contains several previous years. Those years are infrequently accessed the relational warehouse is never used so you specify MOLAP storage with aggregations to the 5% performance level and then archive the relational warehouse to tape. A second major benefit of creating partitions is that you can process a partition independently of the rest of the cube. As a fairly extreme example, suppose that you have an OLAP cube used to monitor manufacturing activities and you want to update the information in that cube every 10 minutes. You don t have time to completely process the database every 10 minutes. By putting the current day into a separate partition, you can process that partition every 10 minutes, without having to process the rest of the cube. In effect, creating a partition for the current day is like performing an incremental update on the cube, except that you can completely replace the values in that one partition every 10 minutes, guaranteeing consistency with the relational data source. A client application has no awareness of let alone control over partitions used on the server. You can modify the design of partitions without affecting any client application. The most important task when creating partitions is to make sure that each appropriate value from the fact table (or fact tables) makes it into one and only one partition.
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Creating Partitions
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When you re creating partitions, make sure each partition gets unique data. Otherwise, it s easy to double-count values in multiple partitions. The dangers of creating partitions are similar to the dangers of executing an incremental update on a cube. This similarity is not coincidental. In fact, when you perform an incremental update on a cube, the Analysis server creates a new partition, loads values into the new partition, and then merges the two partitions. Analysis Services provides two techniques to avoid double-counting:
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Create a separate fact table for each partition. Specify a filter (a SQL WHERE clause) to restrict rows from the fact table.
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In this procedure, you delete the default partition, and then create three new partitions by using partition queries that filter data by date.
12:
Managing Partitions and Database Processing
Create partitions based on fact table filters 1. Start SQL Server Business Intelligence Development Studio (BIDS), and open the SSAS Step by Step solution that you saved in the C:\Documents and Settings\<username> \My Documents\Microsoft Press\as2005sbs\Workspace folder. Note
To complete this procedure, you must be using either Enterprise Edition or Developer Edition. If you skipped 11, Implementing Security, open the SSAS Step by Step solution in the C:\Documents and Settings\<username>\My Documents \Microsoft Press\as2005sbs\Answers\chap11\SSAS Step by Step folder.
2. In Solution Explorer, double-click SSAS.cube to open the Cube Designer, and then click the Partitions tab. As you learned in 7, Designing Aggregations and Hierarchies, every cube has at least one partition by default. A new partition is created every time that you create another measure group. In the SSAS cube, you can see there are nine partitions Reseller Sales, Internet Sales, Product Forecast, Inventory, Distinct Count, Finance, Fact Account Manager, Currency Exchange Rates, and Units Forecast. The first partition of the cube is always expanded when you first open the Partitions tab, and all other partitions are collapsed. For this procedure, you re creating new partitions that are differentiated by date, but use the same fact table as a source. The first new partition will contain historical transactions with order dates up to and including 2002, the second partition will contain transactions from 2003, and the third partition will contain data for 2004 and later. You can t change the existing default partition by adding the WHERE clause; instead, you must delete that partition and then add a new one that includes the applicable filter. 3. Right-click the first row of the table for the Reseller Sales partition, click Delete, and then click OK. Deleting the partition does not delete the Reseller Sales partition section of the designer, but you must define a new partition for this measure group before you process the cube. If you plan to maintain separate fact tables for each partition, then you can simply create each new partition with a SELECT statement that includes all data from the assigned fact table. On the other hand, if you plan to create multiple partitions from a single fact table, you need to add a WHERE clause to the SELECT statement to control which data goes into which partition. 4. Click the New Partition link to launch the Partition Wizard, and then click Next.
Part IV:
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