删除（合并）SQL Server的数据库辅助数据文件

Question

I have a database backup for which SQL Server Management Studio says that it has three files in it: an .mdf file, an .ndf file and one .ldf file. This secondary data file (the .ndf one) was created for no obvious reason, so I want to remove it altogether (without losing data, of course), preferably during while the database is being restored from the backup.

Is this at all doable?

Answer 1

Ok, found a solution.

First back up the database.

Execute this:

USE database_name;

Then execute this, and replace logical_ndf_file_name with the logical name of your NDF file (which you can easily find out via Database->Properties_Files):

DBCC SHRINKFILE('logical_ndf_file_name', EMPTYFILE);
ALTER DATABASE database_name REMOVE FILE logical_ndf_file_name;

Answer 2

I ran the empty followed by ndf drop during produciton load successfully. I think it is important to run the drop ndf in the same transaction as the empty to ensure the database doesn't try to write to the file you are deleting, but then after an empty the database marks the files unusable, evidenced by attempting another empty shorty after.