We had an issue today where users could not rollover a client in an application that used SQL Server Express 2005. The errors in the event log were listed as event ID 5118 and had the content.
The file "C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\MyDatabase.mdf" is compressed but does not reside in a read-only database or filegroup. The file must be decompressed.
The problem had been caused by the Disk Clean Up tool being used on this server and the option to compress old files had been used, this resulted in the MDF and LDF files being compressed and this error occurs.
I entered the properties for the files after stopping the SQLEXPRESS Service and then in the Advanced button in the file properties I chose to uncompress the files. Once I had restarted the SQLEXPRESS Service the database was available to use again.
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