I too have had this problem.
e.g. Our property parcels layer (parcels.tab) is located on a read only shared network directory. As the GIS administrator I was the only user with read/write access to this table.
When updating this layer I would occasionally have the same error that you described and would end up loosing the changes that I had made.
What I discovered was that this error occurred when another user was querying the table that I was trying to save. I had a look at the open files on the server and found –
The parcel.tab, parcel.id, parcel.ind, parcel.map files were opened by me in read mode.
The parcel.tda, parcel.tin and parcel.tma files were opened by me in write+read mode.
AND the parcel.dat was opened by another user in read mode.
My solution to this problem is to save a copy of the table to my hard drive, modify the table as required, then use File|Save Copy As… to save the modified table over the original table on the server.
Hope this helps
Graham Avard
GIS Coordinator
Singleton Council
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of stonerm
Sent: Thursday, 23 February 2006 12:46 PM
To: [email protected]
Subject: [MI-L] Unable to Update table - unknown error encountered.
I’m a very basic user of MapInfo and am having a problem when saving modified tables.
After editing objects(such as node positions, joins etc, general clean up) in the map window for a while, I get the following error when I use the save table function.
“unable to update (modified table name), operation cancelled
Unknown error encountered”
The result is a random deletion of some of the objects that I was editing. In one case approx 60% of the objects were deleted.
I know of another user that is having similar problems, the only way he overcomes this is by constant saves after every operation!
Are there others that have had the same problem? How do you manage the problem?
Are there ways to have the software keep a safer record of the changes that doesn’t require the operator to remember to do it all the time?
I apologise if this is a simple problem that most users know how to fix, but I have looked at the forum archives, the MapInfo forums, help file and spoken with a more advanced and trained user of GIS and still no defined answer.
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