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Steps that you can take to prevent corruption

•  Avoid losing power during database writes.
•  Avoid dropping network connections.
• Avoid abnormal termination of Microsoft Jet connections such as power loss, manual shutdown, having Task Manager shutdown the application, and so on.
•  Fatal system errors almost always cause abnormal termination. If your database is prone to fatal errors, you should resolve the errors before the database becomes too damaged to recover.
•  Compact the database often.
• Avoid a large number of open and close operations in a loop (more than 40,000 successive open and close operations could cause corruption).

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ypical Causes of Access Database Corruption

There are four main reasons why an .mdb file may become corrupted, as follows:
• Interrupted write operation
• Faulty networking hardware
• Opening and saving the .mdb  file in another program
• Mismatched Versions of the Jet Database Engine

Interrupted write operation

You should always properly quit Access by clicking Exit or Close on the File menu. If a database is open and writing data when Access is abnormally shut down, the Jet database engine may mark the database as suspect/corrupted. This can happen if you manually turn off the computer without first quitting Windows or if you lose power. Other situations can occur that do not shut down Access but that may still interfere with Jet writing data to the disk while the database is open. This can happen, for example, when networks experience data collisions or when disk drives malfunction. If any of these interruptions occur, Jet may mark the database as potentially corrupted.

When Jet begins a write operation, it sets a flag, and it then resets the flag when the operation is complete. If a write operation is interrupted, the flag remains set. When you try to open that database again, Jet determines that the flag is set and reports that the database is corrupted. In most cases, the data in the database is not actually corrupted, but the set flag alerts Jet that corruption may have occurred. In cases such as this, compacting or repairing the database (or both) can typically restore the database. Fortunately, there are ways to determine which user and workstation was responsible for marking the file as suspect. With Microsoft Visual Basic for Applications in Access, you can output a list of users who are logged into a specific database.

How to determine which users/workstations are causing the file to be marked as suspect
When you troubleshoot to determine what is causing database corruption, you may have to see who is logged into the database. With Microsoft Visual Basic for Applications in Access 2002 or in Access 2003, you can access a list of users who are logged into a specific database. You can determine who is logged on to a database by using Microsoft Jet UserRoster in Access.
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Faulty networking hardware

Sometimes corruption can occur without the Jet database engine being involved. For example, faulty networking hardware can cause a file to become corrupted. The cause can be one or more links in the hardware chain between the computer that the database resides on and the computer that has the database open. This list includes, but is not limited to, network interface cards, network cabling, routers, and hubs.

Hardware-based corruption is typically indicated by .mdb files that cannot be restored through the use of compacting, repairing, or Jetcomp. Hardware corruption will typically recur until the responsible hardware is repaired or replaced.

Opening and saving the .mdb file in another program

There is no way to recover an .mdb file that was opened and then saved in a different program. For example, you could open and save an .mdb file in Microsoft Word, but if you were to do so, the .mdb file could never be recovered, except from a backup copy. If you accidentally open an .mdb file in another application, be sure not to save it. It really serves no purpose to open an .mdb file in another application because if you do, all you see is a seemingly random series of characters.

Mismatched Versions of the Jet Database Engine

If you run different versions of the Jet Database Engine in your environment, you can also cause corruption of an Access database. Different versions of Jet write to the database differently, and therefore can be the cause of corruption in a database.

Applies to:
• Microsoft Office Access 2003
• Microsoft Access 2002 Standard Edition

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MS Access errors.
Unrecognized database format, Unexpected Error #, The Microsoft Jet Database Engine cannot open the file, Failure to open & failure to show error, Enter database password, Visual Basic for Applications Project in This Database Is Corrupt, An "Invalid Page Fault..." error, You do not have the necessary permissions to open this object. Please contact your system administrator., MDB isn't an Index in this table. Look in the index collection of the TableDefinition object to determine the valid index names, The Microsoft Jet database engine stopped the process because you and another user are attempting to change the same data at the same time, Microsoft Access has encountered a problem and needs to close, The database '....mdb' needs to be repaired or isn't a Microsoft Access database file, operation failed - too many indexes - reduce the number and try again, Invalid field data type, Record(s) can't be read, no read permissions on mdb, This database is in an unrecognized format. The database may have been created with a later version of Microsoft Access than the one you are using. Upgrade your version of Microsoft Access to the current one, then open this database.

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