There are several database applications built on the Microsoft JET (Joint Engine Technology) Database Engine, including Microsoft Access. It is an underlying component of MS Access database (MDB or ACCDB). Jet Database Engine is actually a collection of the information stored on your computer in a systematic way. In case, the Jet Database Engine gets damaged, you can not access your MS Access database and face data loss. In order to get your precious data back, you need to go for access database repair solutions.
Jet Engine corruption is a very common situation with Microsoft Access database, which may occur due to a number of reasons such as improper system shutdown, application malfunction, virus infection, and more. In a practical situation, you may come across any of the below error messages, when you try to access your Microsoft Access database:
“The Microsoft Jet database engine stopped the process because you and another user are attempting to change the same data at the same time.”
“Unrecognized database format 'databasename.mdb'.”
“'databasename.mdb' isn't an index in this table. Look in the Indexes collection of the TableDef object to determine the valid index names.”
After the error message, database can not be accessed. In order to access the database, you need to find out the actual cause of the problem, and perform Access Repair by sorting it out.
Grounds of the problem
You may come across this behavior due to any of the below reasons:
Access database has long value columns that contain bad data. Long value columns are generally stored in table schema.
Microsoft Jet Database Engine had shut down unexpectedly while writing data to hard drive. It may occur due to system crash or power outage.
Missing index on MSysObjects may also lead to this problem. It is generally caused when an Access File Repair process is terminated or aborted.
In order to repair the damaged Access database in such situations, you can use Compact and Repair utility. If it does not work, opt for access database recovery software. The repair applications systematically scan the whole database and restore all of its objects. They are equipped with simple documentation and rich graphical user interface for easy and quick recovery.
Stellar Phoenix Access Recovery is a read-only utility that effectively repairs damaged Access database in all cases of corruption. It works well with Microsoft Access 2007, 2003, 2002, and 2000. The software restores all MDB/ACCDB file objects including tables, reports, forms, queries, constraints, and more.
Source Taken From :-
http://hubpages.com/hub/How-To-Repair-Access-Database-To-Fix-Jet-Database-Engine-Corruption
