2012

Table Of Contents
System Variables
XREFCTL
Controls whether external reference log (XLG) files are created.
Increase Performance with Large Referenced Drawings
There are several features that can improve performance when dealing with
large referenced drawings.
Overview of Demand Loading
The program uses demand loading and saving drawings with internal indexes
to increase performance with large referenced drawings that have been clipped,
or that have many objects on frozen layers. With demand loading, only the
data from the reference drawing that is necessary to regenerate the current
drawing is loaded into memory. In other words, referenced data is read in on
demand.
Demand loading works in conjunction with the INDEXCTL, XLOADCTL, and
XLOADPATH system variables.
Quick Reference
Commands
XREF
Starts the EXTERNALREFERENCES command.
System Variables
INDEXCTL
Controls whether layer and spatial indexes are created and saved in drawing
files.
XLOADCTL
Turns xref demand-loading on and off, and controls whether it opens the
referenced drawing or a copy.
XLOADPATH
Creates a path for storing temporary copies of demand-loaded xref files.
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