Maximum file size for network analyst layer and/or network analyst class?

Discussion created by morangm on Apr 23, 2012
Latest reply on Apr 24, 2012 by jsandhu-esristaff
I'm creating a very large OD cost matrix using Network Analyst. Weird things are happening, and I'm wondering if I'm hitting some sort of maximum file size limit.  Is there a maximum file size or number of rows allowed in the lines sublayer for an OD cost matrix?

For that matter, is it true that the size of shapefiles is limited to 2Gb because of the limitations on the dBase format?

Finally, I feel like this should be a really simple question, but I can't seem to find the answer anywhere in the documentation.  What type of file is a network analyst layer and/or network analyst class?  Is it some sort of geodatabase, or would the sublayers be subject to the same limitations as the shapefiles?