After you append the source tables, the base table grows to accommodate the additional
rows. This consumes memory on
the SAS LASR Analytic Server.
If you do not need to access the source tables after appending them, then you can
select the Unload source tables after appending them to the base
table check box. This option conserves memory, but you must ensure that the source tables
are loaded
to memory again (often with newer data) before you can run the append again.