Exchange server database is built by using Extensible Storage Engine (ESE) technology. The ESE engine employs several files to build database. Exchange server stores data in EDB files. ‘In-process’ and ‘non-SMTP’ messages both are stored in EDB files.
EDB files are stored in b-tree structure, which includes a top level node and many child nodes.Priv1.edb and Pub1.edb are the main EDB files used for the Exchange information store.
All the information about user mailboxes is stored within several EDB files. The EDB file acts as a pointer to the user’s MS Outlook profile. It is also known as repository of all sent/received emails as well as information related to these emails.
Location of EDB file:
When you install Exchange 2000 the default location for your databases and transaction log files will be exchsrvr\MDBDATA.
Due to corruption of EDB file you may get the error message:
“Database page read failed verification because of a -1018 error”.
Above error message indicates that the database verification was failure because of some page checksum mismatched. This specific database page is a file in Exchange Store and thus error specifies that the individual file (may be priv1.edb) is damaged or corrupt.
Here are some major reasons for EDB file corruption:
- User mailbox deletion
- Software and hardware malfunctioning
- Exchange Server crash
- EDB .log file Deletion
- Power outage
- Power failure
- Trojan infection or Virus attack
- Dirty system shutdown can cause corruption to EDB files
- Malfunctioning in application can harm EDB files
- Over sized files using more space.
- The errors due to the JET engine in the system.
- The corruption of your file header.
- Virus Attack.
- Duplicate key error
- Accidental deletion of user’s mailbox
- Errors due to file transmit.
Due to EDB File Corruption you cannot access your emails, calendar, contacts and other essential information which is stored in your mailbox that is located on Exchange Server. To open corrupted EDB files, you need to repair them. For that, you require some Exchange server recovery software that let you extract mail data from a corrupt EDB File or damaged Exchange store that cannot be attached to server.