My sql server marked one database as suspected , on checking i found my mdf,ldf files are missing, but no errors on chkdsk, what it means some virus ?
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My sql server marked one database as suspected , on checking i found my mdf,ldf files are missing, but no errors on chkdsk, what it means some virus ?
Either the files were deleted, or they have been moved and a master database backup restored from before the change in location. In both cases the physical files can only be deleted or moved if the database is offline – either because sql server was shut down or the database was closed.
Either of these things is highly unlikely to have happened accidentally. It’s unlikely to be a generic virus or trojan as such would either have to specifically delete the files on startup before SQL Server started (assuming your database starts automatically) or shut down the database then specifically delete the files. Given that chkdsk doesn’t report errors either it’s unlikely to be a disk issue, so it’s a virtual certainty that the cause of the error is deliberate database (mis)management.
I think the most likely option is that a dba has decided that the files should be moved elsewhere – typically this is done for space or performance reasons – for instance if a new drive is added to a machine that is running out of space then the database could be moved to that. For some reason a backup of the master database has subsequently been restored from a point before the move.
My first action would be to do a full scan of the system for all mdf/ldf files and (hopefully) locate them. I’d also do a scan of backups and look for the latest master database backup. You could either then try restoring the last master backup and see if that fixed the issue (i’d back up the current master first of course), and failing that, or directly, reattach the missing files.
If you cannot find the mdf/ldf files then your only option is restore from backup. If you don’t have a backup then your database is lost.