Tag Archive: Data Structures

Jan 31

Using Maps for ETL Aggregation

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Introduction You’re trying to decide which products are most important to your customers, or maybe the marketing team is interested in how many widgets have been sold to each industry, or you’re trying to list which five pages in your project are most viewed. To add another wrinkle, the key stakeholders in your project want to …

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Jan 25

Using Sets to Handle Duplication in Large Scale ETLs

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Introduction We’ve all been in the situation where you’re processing a ton of information for your ETLs, but you’re dealing with a lot of duplicates in the data. There are so many duplicates that you’re actually running out of memory or your database updates are taking forever. Ho do you deal with them? Do you throw all the entries …

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