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hi all give me simple scenario in data island.
i mean where exact using data island.
Data Islands are group of unassociated data tables. In qlikview it is not that always every table in your data model will contribute to form a Star Schema. There might be few tables which are not associated to any other tables in the Data Model and the data from these tables will be used in your Dashboard for reporting purposes.
check this link
//www.packtpub.com/packtlib/book/Big-Data-and-Business-Intelligence/9781782171669/6/ch06lvl1sec51/Data%20islands
As per my knowledge, data island are those table in data model which are not linked to any other table.
For eg, if you have a inline table which is not linked to our data table then that inline table is data island.
I would add also this
The Impact of Data Islands on Cache and CPU | Qlikview Cookbook
When we are creating Ad-Hoc reporting. We need to create the Dimension and Measure Table using Inline load. Then these tables are Data Island.
One of the simplest scenarios is this (it's really simple, never mind the number of words I need to explain it):
Best,
Peter
chk below