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Multi-user ADO connection to Access database : "Unrecognized database format"

Posted on 2008-06-13
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Last Modified: 2013-12-20
I have an Excel pivot-table application that links to an Access database using ADO.

The pivot-tables are populated by ADO recordsets of tables in Access. There are several copies of the Excel frontend in use; a problem occurs if all the users open up their workbooks at the same time: multiple users cannot make a recordset of the same table at the same time. As soon as User 1's version has loaded the recordset to its pivot-table cache and closed the recordset, User 2's version can successfully do the same. But if both attempt to create a recordset of the same table at the same split-second moment, one of them will get either "Unrecognized database format" or "Could not use . . . file already in use".

I can make code execution loop until User 1 has closed his recordset by putting Resume in the procedure's error_handler, but I'd rather not.

As far as I can see, the ADO connection allows multiple users to connect to a table as I have created my connection with adoCn.Mode = adModeShareDenyNone.

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Question by:TimHudspith
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by:jmantha709
ID: 21779773
If you have many users, it might be better to switch to SQL Server instead of Access.
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by:TimHudspith
ID: 21779816
I was thinking of a shorter-term solution.
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jmantha709 earned 500 total points
ID: 21779896
Well, I don't really know about the specific problem you're having, but for patching it short-term, use your Resume idea but also use a date/time variable that if you get in the resume mode, you don't get stuck there indefinitely.  Set the variable to the time you start the procedure, and just before resuming check the time difference between it and the currenttime.  After a certain acceptable treshold, exit instead of resuming.
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