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SAS Certification Prep Guide, 4th Edition by SAS Institute

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Storing Data in SAS Data Sets

Overview

In many cases, it is best practice for you to store data in SAS data sets. You can optimize performance if you know when you should create a SAS data set and when you should read data directly from an external file.
Before viewing the comparative example that illustrates different techniques for reading from a SAS data set versus from an external file, consider the following advantages of storing data in SAS data sets.
When you use SAS to repeatedly analyze or manipulate any particular group of data, it is more efficient to create a SAS data set than to read the raw data each time. Although SAS data sets can be larger than external files and can require more disk space, reading from SAS data sets saves ...

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