Inserting only new records

Hi All,

I am using SQL Server 2008 R2.

In my SSIS Package, Source has the data from Oracle and Destination is SQL.

I always truncate my data first and then pull the data. However its consuming lots of time.

Source table has more than 6 million of data.

When I add a Lookup Transformation and redirect rows to no match output, I am getting Memory issue when I select full cache mode.

Please let me know how I can insert only new records into my destination table.

Thanks in advance, Akhila Vasishta