Question

I have to update every row in a Sql Server table with about 150,000 records using entity framework. To reduce the amount of hits the server takes, I would like to do this in separate batches of 1000 rows. I need entity framework to:

1. Select the first 1000 rows from the DB.
2. Update those rows.
3. Call SaveChanges() method.
4. Get next 1000 rows.
5. Repeat.

Whats the best way to achieve this?

I’m using entity framework 4 and SQL Server 2012.

Answer 1

something like this should work:

int skip =0;
int take = 1000;
for (int i = 0; i < 150; i++)
{
var rows = (from x in Context.Table
            select x).OrderBy(x => x.id).Skip(skip).Take(take).ToList();

//do some update stuff with rows

skip += 1000;
}