SQL Server 2008 R2 Varbinary Max Size

Question

What is the max size of a file that I can insert using varbinary(max) in SQL Server 2008 R2? I tried to change the max value in the column to more than 8,000 bytes but it won't let me, so I'm guessing the max is 8,000 bytes, but from this article on MSDN, it says that the max storage size is 2^31-1 bytes:

varbinary [ ( n | max) ]

Variable-length binary data. n can be a value from 1 through 8,000. max indicates that the maximum storage size is 2^31-1 bytes. The storage size is the actual length of the data entered + 2 bytes. The data that is entered can be 0 bytes in length. The ANSI SQL synonym for varbinary is binary varying.

So how can i store larger files in a varbinary field? I'm not considering using a FILESTREAM since the files I want to save are from 200kb to 1mb max, The code I'm using:

UPDATE [table]
SET file = ( SELECT * FROM OPENROWSET ( BULK 'C:\A directory\A file.ext', SINGLE BLOB)    alias) 
WHERE idRow = 1

I have been able to execute that code successfully to files less or equal than 8000 bytes. If i try with a file 8001 bytes size it will fail. My file field on the table has a field called "file" type varbinary(8000) which as I said, I can't change to a bigger value.

Answer 1

I cannot reproduce this scenario. I tried the following:

USE tempdb;
GO

CREATE TABLE dbo.blob(col VARBINARY(MAX));

INSERT dbo.blob(col) SELECT NULL;

UPDATE dbo.blob 
  SET col = (SELECT BulkColumn 
    FROM OPENROWSET( BULK 'C:\Folder\File.docx', SINGLE_BLOB) alias
  );

SELECT DATALENGTH(col) FROM dbo.blob;

Results:

--------
39578

If this is getting capped at 8K then I would guess that either one of the following is true:

1. The column is actually VARBINARY(8000).

2. You are selecting the data in Management Studio, and analyzing the length of the data that is displayed there. This is limited to a max of 8192 characters in results to text, if this is the case, so using DATALENGTH() directly against the column is a much better approach.