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Message Posted: Mon, 16 Oct 2006 @ 12:38:17 GMT

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<-- Anonymously Posted: Monday, October 16, 2006 08:31 -->

Check the section in the Database Design manual titled Join Index Storage.

When you define a JI, the syntax allows you to optionally separate the fields in the SELECT list into two groups: "Column_1" (in essence, this becomes the PI for the JI) and "Column_2". If there are multiple JI rows with the same set of values for all the "Column_1" fields inserted at the same time, they may be "compressed" into one physical row containing data for multiple "logical rows" .

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