A file with a B+-tree index is an indexed-sequential file.

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A B+-tree is an index structure used to organize data in a file, providing efficient access to records based on a key value. The B+-tree index is usually used in an indexed-sequential file, which is a file organization that combines the efficiency of sequential file access with the flexibility of indexed file access. Therefore, a file with a B+-tree index is an indexed-sequential file.

A File with a B+-Tree Index Is an Indexed-Sequential File