what causes 'Updating Indexes for block *Model_Space'?

[Fred Clark]

Each time I save my drawing I receive the prompt "Updating Indexes for
block *Model_Space" I have not seen this prompt in the pass. Is any
familiar with it?

[R.K. McSwain]

On 8/23/2004 7:01 PM Fred Clark wrote:
Each time I save my drawing I receive the prompt "Updating Indexes for block *Model_Space" I have not seen this prompt in the pass. Is any familiar with it?

Your sysvar INDEXCTL is set > 0

Check out INDEXCTL in HELP
Check out the topic "Increase Performance with Large Xrefs" in HELP also.

[Fred Clark]

R.K. McSwain wrote: On 8/23/2004 7:01 PM Fred Clark wrote: Each time I save my drawing I receive the prompt "Updating Indexes for block *Model_Space" I have not seen this prompt in the pass. Is any familiar with it? Your sysvar INDEXCTL is set > 0 Check out INDEXCTL in HELP Check out the topic "Increase Performance with Large Xrefs" in HELP also.
Thanks. What are the benefits of indexes?

[R.K. McSwain]

On 8/24/2004 9:46 AM Fred Clark wrote:
Thanks. What are the benefits of indexes?

It's explained in HELP under the topic "Increase Performance with Large
Xrefs", as mentioned,

From HELP
====================================
To realize the maximum benefits of demand loading, you need to save the
referenced drawings with layer and spatial indexes. The performance
benefits of demand loading are most noticeable when you do one of the
following:

Clip the xref with AutoCAD to display a small fraction of it, and a
spatial index is saved in the externally referenced drawing.
Freeze several layers of the xref, and the externally referenced drawing
is saved with a layer index.
Note: Clipped external references are available only in drawings created
with AutoCAD Release 14 or later.

If demand loading is turned on, and you have clipped xrefs that were
saved with spatial indexes, objects in the external reference database
that are contained within the clip volume comprise the majority of the
objects read into the drawing. If the clip volume is modified, more
objects are loaded as required from the reference drawing. Similarly, if
you have xrefs with many layers frozen that were saved with layer
indexes, only the objects on those thawed layers are read into the
current drawing. If those xref-dependent layers are thawed, AutoCAD
reads in that geometry from the reference drawing as required.

When demand loading is turned on, AutoCAD places a lock on all reference
drawings so that it can read in any geometry it needs to on demand.
Other users can open those reference drawings, but they cannot save
changes to them. If you want other users to be able to modify an xref
that is being demand loaded into another drawing, use demand loading
with the Copy option.

If you turn on demand loading with the Enable with Copy option, AutoCAD
makes a temporary copy of the externally referenced file and demand
loads the temporary file. You can then demand load the xref while
allowing the original reference drawing to be available for
modification. When you turn off demand loading, AutoCAD reads in the
entire reference drawing regardless of layer visibility or clip instances.

Layer and spatial indexes were added in AutoCAD Release 14 and AutoCAD
LT 97. If you externally reference a drawing saved in an AutoCAD release
previous to this, you do not see the same performance benefit as
drawings saved with the indexes. For maximum performance, use demand
loading with referenced drawings saved with layer and spatial indexes
turned on in AutoCAD Release 14, AutoCAD LT 97, or more recent versions.

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