This blended index setting allows you to select which blended index you're editing.

When you look at lists of indexes, you'll see your blended index name with a (b) next to it, to differentiate it from any system indexes.

When using Select blended index, you can choose from among the following:

You can complete the following actions for blended indexes:

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Blended indexes are available on any report where you can include additional indexes. For more information on blended indexes, see Blended Indexes.