Exchange Server transaction logs are stored on Exchange computer hard drive and are crucial for the working of database (*.edb) file. When you start any Exchange Server, ESE (Extensible Storage Engine) checks the database for consistency. This information is revealed by a specific flag in the database header that shows database status as dirty or clean. The dirty database status indicates that there are some uncommitted transactions that need to be replayed. Exchange tries to replay them at the time of mount, but may fail if cannot read them. The reason can be corruption of log files. Such situations can force you to use an
EDB Repair Software.
To comprehend these potential problems, consider you use Exchange Server 2007. You experience an unexpected crash (Dirty database shutdown). The next time when you try to mount the database, it gives the below error message:
-1852 0xFFFFF8C4 JET_errLogCorrupted
Logs could not be interpreted 4294965444...
The key construct of an Exchange database file, EDB, is B-trees. Similar to all other B-trees, these structures have hierarchical pages and indexes to allow fast and efficient search. An Exchange Server database show abrupt symptoms, when these indexes get corrupt or are missing. This can occur due to numerous reasons and will make you resort to
EDB Repair steps.
While Exchange database indexes are corrupted or missing, the MS Exchange database troubleshooter tool can encounter several entries with event ID 9519 having error code 0xfffffa84 logging in the application log. Due to this, Exchange Server users might experience problems while accessing or mounting the database.
This problem is observed in MS Exchange Server 2000, 2003 or 2007.
Cause
Error 0xfffffa84 of event ID 9519 is logged, if database index corruption is when you:
1.Run database repair command- eseutil /p...
Most of the Exchange database problems (including corruption) occur because the administrator continues to use the very old hardware without any refresh. Thus, it is suggested to keep a timely check through application log and related information. Once the EDB database corruption is confirmed, the administrator can either restore from a good backup or select an
EDB Repair option.
To comprehend such situations, let us consider a problem when you cannot mount the Exchange database. You observe that all Exchange services run without any error, but when you try to mount the database, it reports an error as below:
Event Type: Error
Event Source: ESE
Event Category: Logging/Recovery
Event ID: 412
Date: 7/3/2008
Time: 1:40:37 PM
User: N/A
Computer: SMTPBRMDBALEX2
Description:
Information Store (4948) e53f288d-df1b-47ba-9c3b-901e530848a5: Unable to read the header of logfile E:\exchsrvr\mdbdata\E003C9F3.log. Error -530....
An Exchange Server database can get corrupt for several reasons, which include unexpected power failure, corrupted log files, network errors, virus infection and others. Consequently, the database may stop and fail to mount. You can try repairing the database using eseuitl utility. If this fails too, it compels you to apply the latest backup available or repair the database by an
EDB Repair product.
For instance, you might come across the below error when dealing with Microsoft Exchange Server:
“Database page read failed verification because of no page data.”
It further suggests to move the existing databases to a new hardware. The error is logged with event 476 in application event log.
Cause
The above error means that the database read operation has failed It generally occurs with error 1019. The causes are:
1.The specific database page that has been referenced within the database file is expected to be in use, but Exchange finds it empty or uninitialized...
