Setting string to be sql type of “varchar” instead of “nvarchar”

Question

I have the following mapping:

public class LogEntryMap
{
    public LogEntryMap()
    {
        Map.Id(x => x.Id).GeneratedBy.Identity();
        Map(x =&         


        

Answer 1

We found using the "CustomType("AnsiString")" option does prevent it from using the nvarchar, however, it sets the field length of 8000 for a column that is specified as varchar(30). The 8000 varchar is much faster than 4000 nvarchar, but it is still causing huge problems with sql server overhead.