Id location is in place - and has Ids in the first index, like ^myclassD(1),^myclassD(2), etc.

But nothing is set in ^myclassD

Other parameters I have:

Property id As %Library.BigInt [ SqlColumnNumber = 14 ];

Parameter ALLOWIDENTITYINSERT = 1;

Index MYCLASSPKEY1 On id [ IdKey, PrimaryKey, SqlName = MYCLASSPKEY1, Unique ];

And I import IDs from the csv file.

so my 

set newid=$I(newid)

part uses $Increment

Yes, $I is the short of $Increment.

But from which global?

$Seq is a faster option of $Increment