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This is documentation for Caché & Ensemble.

For information on converting to InterSystems IRIS, see the InterSystems IRIS Adoption Guide and the InterSystems IRIS In-Place Conversion Guide, both available on the WRC Distributions page (login required).

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Extent

Defines an extent index.

Usage

To specify that this is an extent index, use the following syntax:

Index State [ Extent ];

Otherwise, omit this keyword or place the word Not immediately before the keyword.

Note:

If you are using bitmap indices, then an extent index is automatically maintained and there is no need to define one.

Details

An extent index is used to keep track of which object instances belong to a subclass.

Default

The Default for the Extent keyword is false.

See Also