_____________ is a snapshot of the data that Tableau stores locally. Good for very large datasets of which we only need few fields.

Tableau Data Extract (TDE) is a snapshot of the data that Tableau stores locally. Good for very large

datasets of which we only need few fields. Performance is optimised because it queries its own

database engine instead of the local data source.

When you create an extract of your data, you can reduce the total amount of data by using filters and

configuring other limits. After you create an extract, you can refresh it with data from the original

data. When refreshing the data, you have the option to either do a full refresh, which replaces all of

the contents in the extract, or you can do an incremental refresh, which only adds rows that are new

since the previous refresh.

Extracts are advantageous for several reasons:

1) Supports large data sets: You can create extracts that contain billions of rows of data.

2) Fast to create: If you're working with large data sets, creating and working with extracts can be

faster than working with the original data.

3) Help improve performance: When you interact with views that use extract data sources, you

generally experience better performance than when interacting with views based on connections to

the original data.

4) Support additional functionality: Extracts allow you to take advantage of Tableau functionality

that's not available or supported by the original data, such as the ability to compute Count Distinct.

5) Provide offline access to your data: Extracts allow you to save and work with the data locally when

the original data is not available. For example, when you are traveling.