Logical corruption to Exchange Server is a very common problem. It could occur due to corruption problems with Information Store, Tables, Keys, Indexes or sometimes to whole database.
Logical database corruption is more problematic and difficult to identify than the physical database corruption. The database administrator and users are generally unaware of logical corruption incidence. Unluckily Exchange Server does not contain any in-built utility to diagnose it.
There are so many reasons due to which the logical corruption can take place. Some major causes of logical corruption are as underwritten:
. Deletion of Edb.log File: Some records in Edb.log (log file) might contain changes to the pages, which have been flushed out to the Exchange Server database. If this file is removed, it may cause incomplete transaction. Incomplete transactions might result into internal inconsistency of the database.
. Write Back Cache: When you run unprotected write back caching against log drive, the logical corruption might take place. Unprotected write back cache is one in which the database gets lost, if the any hardware failure or power failure occurs. When the write operations is completed, ESE (Extensible Storage Engine) commits a transaction and makes the information durable on disk.
Once the write operation is complete on the log disk, ESE is free to flush the particular page on the database. If the write operation was unsuccessful, the same problem of logical corruption strikes. Problems occurred while using write back cache don’t prevent the user from using the write back caching.
. Repairing EDB using Eseutil /p: Logical database corruption might also take place when you apply Eseutil /p command to perform jet-level repair. It may cause data loss and incompetent space used in database as the repair fixes the EDB by removing the corrupted data.
If any of the above situations occurs to your database, it may cause logical database corruption. To identify the logical corruption, you need to regularly perform integrity check (Isinteg –fix) or inconsistency check (Eseutil /mh).
Regardless of the cause of logical database corruption, the ultimate result would be the inaccessible Exchange Server database and the loss of your valuable data.
Due to the importance of Exchange Server database for your organization, it is very important to perform Exchange Server recovery. You can easily carry out EDB recovery using the Exchange Server repair software. These are the third party tools, specifically designed to repair and restore your damaged database.
Exchange Server recovery software is a powerful tool to systematically scan the entire database and extract each and every bit of your valuable data. EDB repair software are easily obtainable from Internet and here you may also find the free demo versions of these software to check them out before purchasing.
Stellar Phoenix Mailbox exchange recovery software is the robust EDB recovery software, which is applicable to all file versions of Microsoft Exchange Server and can recover all of the database objects. Interactive user interface, powerful scanning procedures, Live Update and read only design are some major features which make this software world class. To know more about the product, download free demo version from Stellar’s website.