Log on to the mailbox and start sending messages until you have a couple of messages and a couple of log files. If we have all the log files still available it should be possible to retrieve all information.
Remember what I wrote in my previous article: “everything is logged in the log files, even the creation of database files!
When a database is created in the Exchange Management Console there is still an empty directory on the disk.
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The first three steps do not need any further explanation. When dismounting the database all information in the log files that is not yet committed to the database is flushed to the database file. You can check in the database header information when the database was dismounted by looking at the “last detach” information.
Also check that the database is in a clean shutdown and does not need any log files for mounting.
Starting with Exchange Server 2003 Service Pack 1 Exchange has error correcting code for checksum errors.
If a certain page contains a checksum error, which is usually caused by only one bit being “flipped”, Exchange Server can automatically correct this bit.
It is always possible to recover data when the database is lost, if you have backed up the database.& In my previous article, Exchange Database Technologies, I discussed the underlying database technology in Exchange Server, the Extensible Storage Engine or ESE.
One of the most important points in that article was that all changes to the Exchange Server database go through the log files. Let’s look at the log files, and the replay of log files in case of a recovery scenario…
But after upgrading the previously-primary replica I noticed that the databases on it were listed in SSMS as Not Synchronizing / In Recovery.
Also trying to access them would generate an error message: Querying the master..sysdatabases table showed that it was indeed an older version and had not been updated during the upgrade: Unfortunately the logs did not indicate why it wasn't updated, and the Availability Groups Dashboard only gave a generic warning indicating the Data synchronization state of some availability database is not healthy with no reason why.
While testing an upgrade from SQL Server 2014 SP1 (12.0.4422.0) to SQL Server 2016 CTP 3.2 (13.0.900.73) I was following the recommended update process and ran into an issue where the database would not start on the old primary after failing over to the updated secondary.