SQL Server – Fix – Error: 17204 and FCB::Open failed

1. First error in Windows Application log file
FCB::Open failed: Could not open file D:Program FilesMicrosoft SQL ServerMSSQL11.MSSQLSERVERMSSQLDATAMyDB.mdf for file number 1. OS error: 32(The process cannot access the file because it is being used by another process.).

2. Second error.
Error: 17204, Severity: 16, State: 1.

The fix (for me)

ALTER DATABASE MyDB SET ONLINE

See also this.
And this and this command “alter database set emergency dbcc checkdb (repair_allow_data_loss)”.

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