docs.intersystems.com
Home / Class Definition Reference / Index Keywords / Extent

Class Definition Reference
Extent
Previous section           Next section
InterSystems: The power behind what matters   
Search:  


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


Previous section           Next section
View this book as PDF   |  Download all PDFs
Copyright © 1997-2019 InterSystems Corporation, Cambridge, MA
Content Date/Time: 2019-04-10 14:45:57