The default number of allowable Undo operations for a geodatabase is 30. After 30 consectutive Undo operations, the Undo button will become disabled. This limitation cannot be changed for a personal geodatabase because it is a limit imposed by the MicroSoft Access format. The default limit of 30 can be changed for data stored in SDE by adding a registry key and specifying a value larger than 30 for the key.
WARNING: This article contains instructions to make specific changes to essential parts of your operating system. If these specific changes are not done correctly, it may cause serious problems to your computer operating system and files. First, ESRI recommends that you make a complete backup of your system, including the registry, before implementing any of the specific changes. It is highly recommended that you consult with your IT/MIS department, or other qualified computer systems professional before proceeding. ESRI cannot guarantee that you can solve problems that result from incorrect use of the Registry Editor utility. Use the Registry Editor utility at your own risk. Note: your operating system and any subsequent service packs may affect these instructions. These instructions are subject to change without notice.
The registry key should not be set without consent from development.
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