Which of the following is not a logical database structure?

Tree

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Relational

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Network

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Chain

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Solution

The correct option is D Chain
Chain is not a logical database structure.

Logical database structure:-

The logical units of database space allocation are data blocks, extents, segments, and table spaces. At a physical level, the data is stored in data files on disk. The data in the data files is stored in operating system blocks.

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