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This is documentation for Caché & Ensemble. See the InterSystems IRIS version of this content.

For information on migrating to InterSystems IRIS, see Why Migrate to InterSystems IRIS?

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

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