You can use the pushdown
feature to specify that the relational database code in the job is
processed in the relational database server. This feature enables
you to verify that your job contains tables and transformations that
support pushdown. It also enables you to validate your job for pushdown
and confirm that pushdown processing occurs when you submit the job.
When both the inputs
and outputs of the Extract, SQL Join, Teradata Table Loader, and Table
Loader transformations are stored in the same relational database,
the code for these transformations can be pushed down to a database
server for execution. This option increases performance by shifting
data transformation to the most appropriate processing resource.
Note: The use of the Table Loader
transformation in a pushdown job requires the following settings:
-
Load style:
select either
Append to Existing or
Replace
-
New Rows:
select
Insert (SQL)
Database processing
is validated whenever a job is run. If a job can be run on the database
server, it is by default. You can also perform a check to determine
whether it is possible to use database processing for a job. This
check is strictly diagnostic. It validates only the possibility of
database processing without running the actual job. To run this check,
click
Check Database Processing in the job
toolbar.
Database processing
can fail for a variety of reasons. The following causes are common:
-
using SAS data set options
-
requesting views instead of tables
-
disabling the
Use the
optimized pass-through facility for SQL statements option
on a transformation