Incremental Load (Append Into QVD File)

[#1]

hello dears.

i implemented Incremental Load (Insert ,Update ,Delete)

i have a problem .

for the first time , i created qvd File. (i don't problem)

let vQVDExistsFile=isnull(QvdCreateTime('$(vSourceQvdFile)SaleQVD.qvd'));

if vQVDExistsFile=-1 then

  Sale:

  LOAD OrderId,

      ProductId,

      CustomerId,

      Amount,

      Date_Updated,

      Num(Date_Updated) as NumDate

  FROM

  $(vSourceData)Sale.xlsx

  (ooxml, embedded labels, table is Sheet1);

  Store Sale into $(vSourceQvdFile)SaleQVD.qvd(qvd);

END IF

I found that change records for the second time

But i Can not Append into SaleQVD.qvd

All New Records (Update,Delete) Override into SaleQVD,Not Append

[#2]

no , i want Implemented Incremental Load on fact Tables  With millions Record.

i want Test And Applied in Fact Table