How to load huge (but simple) hierarchical XML file into an SQL table

Question

I have a very large (2.5GB, 55 million node) XML file with the following format:

<TopNode>
    <Item id = "Something">
         <Link>A link</Link>
         <Link>Another link</Link>
         <Link>One More Link</Link>
    </Item>
    <Item id = "Something else">
         <Link>Some link</Link>
         <Link>You get the idea</Link>
    </Item>
  </TopNode>

I want to flatten this into the following SQL table:

 -----------------------------------------
 |  Item          |          Link        |
 -----------------------------------------
 | Something      |  A link              |
 | Something      |  Another link        |
 | Something      |  One More Link       |
 | Something Else |  Some Link           |
 | Something Else |  You get the idea    |
 |----------------|----------------------|

I'm using SQL2008, if that makes a difference.

What's the simplest, most efficient way (preferably using the SQL Server/.NET stack) to get from point A to point B, keeping in mind the size of the file involved?

Answer 1

Take a look at Oslo/M.

Answer 2

I would use the XML Bulk Load. This is a nice approach because it doesn't read in the entire document at once, it streams it. It's also quite fast and keeps to your requirement of sticking with an SQL Server based tool.