Limit of the Number of Simultaneously Open Root Storage Files (163202)
The information in this article applies to:
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Server 4.0
This article was previously published under Q163202 SYMPTOMS
Applications that use StgOpenStorage() or StgCreateDocFile() API calls to
open several storage files may fail.
This problem does not occur in Windows 95 or Windows NT 3.51.
CAUSE
Windows NT 4.0 limits the number of simultaneously open root storage files
to around 500 PER PROCESS. It should be noted that this is a per process
limit (for example, Process 1 can open 498 root storages, at the same time
Process 2 can also open 498 root storages, and so on.)
Windows 95 and Windows NT 3.51, use a global shared memory heap of 64M;
whereas Windows NT 4.0 uses a per-root-open heap of 4MB. Assuming a 2G user
address limit for processes, Windows NT 4.0 supports around 500 root opens
for a process.
RESOLUTION
On Windows NT 4.0 per-root-open heap size was further reduced to 2MB
allowing around 1000 opens. A reduction in heap size means applications
will not be able to open as many sub-storages or keep as many transacted
changes uncommitted.
STATUS
Microsoft has confirmed this to be a problem in Microsoft Windows NT
version 4.0. This problem was corrected in the latest Microsoft Windows NT
4.0 U.S. Service Pack. For information on obtaining the service pack, query
on the following word in the Microsoft Knowledge Base (without the spaces):
| Modification Type: | Major | Last Reviewed: | 8/8/2001 |
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| Keywords: | kbbug kbinterop kbnetwork KB163202 |
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