问题
I need to create a test database out of a huge database where the most data is contained as filestream data.
I need to test not filestream related data, so what I'd like to do is to remove the varbinary(max) info.
These are the fields I have in my FILE_REPOSITORY_TABLE table:
[ID_FILE] [int] NOT NULL,
[FILE_DATA] [varbinary](max) FILESTREAM NULL,
[GUID] [uniqueidentifier] ROWGUIDCOL NOT NULL
What I tried to do is
Update FILE_REPOSITORY_TABLE
SET FILE = NULL
I was expecting this to delete the files too, but it didn't happen.
I cannot delete the records, since ID_FILE has FK links. (when deleting records from a table containing filestream data also the related files are deleted). I also tried to do a backup anyway but the file size was big, even if the table is full of NULLs.
How can I do?
Final note: my goal is to have a 500MB backup instead of a 10GB one (I have 9,5 GB of docs). THis is only for testing purposes.
回答1:
The file data is reclaimed through a garbage collection process, rather then being removed immediately. Related blog post, so you might need to force checkpointing to occur.
来源：https://stackoverflow.com/questions/3650045/how-to-set-to-null-all-the-filestream-varbinarymax-fields