|Component:||Microsoft Exchange Extensible Storage Engine|
|Message:||<process name> (<process id>) <storage group name>A bad page link (error <error code>) has been detected in a B-Tree (ObjectId: <id>, PgnoRoot: <number>) of database <name> (<number> => <number>, <number>).|
A corrupted page link was detected in a B-Tree.
Available space in the Exchange store database is in the form of a list of pages that can be used to store new data. The available space is called a space tree. The space tree is held as a binary tree that is searched whenever a block of new data needs to be added to the database.
During an online defragmentation, a problem was discovered in this tree. This is often caused by a hardware failure or antivirus scanning of the database file directory.
If you receive these errors in your application log, it is suggested that you restore from an online backup as soon as you can. A bad page link error signifies logical corruption at the Jet level in the database, and it is not safe to continue using the database. Note: The restore must be performed using a backup before this error occurred. In a worst case scenario, a hard repair followed by an isinteg -fix and then an ExMerge of the database may be required if no good backup exists. If you need help with a hard repair followed by an isinteg -fix and then an ExMerge or if the problem persists, contact Microsoft Product Support Services.