Friday, September 29, 2006

Dynamic Partition Creation and Processing – Part 2

The first part of this post discussed how to identify whether a partition existed and create a partition dynamically. Although this post is a little on the suck eggs side I thought it would be better to write it for completeness. Processing a package can be performed using the exact same techniques that are used for dynamic partition creation thus the suck eggs comment.

First let’s look at the XMLA query for processing a partition similar to the one created in the previous post.






<DatabaseID>Adventure Works DW</DatabaseID>

<CubeID>Adventure Works DW</CubeID>









Note there’s no mention of the partition name anywhere. The partition is processed using its ID and that is all we are really interested in. Replacing just that value in the Source expression in an SSIS Analysis Services Execute DDL Task will point us to the correct partition for processing.

Of course if the entire cube structure is built on the same partition naming strategy then creating s single script to process all of this periods partitions is relatively easy. The added bonus of being able to process partitions in parallel can prove a huge advantage in reducing the time taken to update the cube on whatever schedule you have.

These examples are based on cubes structured with monthly or period based partitions. Partition strategy is an important subject for both cube querying and processing performance. I’ll leave that to another post but I just wanted to state that employing a rules mechanism that say merged period based partitions into a single year partition whilst creating new partitions on the fly does not need to be a massively complex process. The methods I’ve discussed in the two posts are probably some of the simpler ways of implementing this.

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