Data Transformation Engine Map Designer Reference Guide

Chapter 5 - Card Settings SourceRule Input Card Settings
Map Designer Reference Guide
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Value Description
Burst Data is retrieved in incremental units from the data source.
The unit of data retrieved for each burst is adapter-specific,
and is specified as the Source FetchUnit. When an input
FetchAs is Burst, the data is retrieved once per burst.
Note When an input FetchAs is Integral, any failure action causes the entire map to
fail.
♦ When FetchAs is Integral, the maximum size of a file that a map can process
is 2 GB.
♦ When FetchAs is Burst, the maximum size of a file that a map can process is
much larger, but a maximum of 2 GB per burst.
FetchAs > WorkArea
Each time a map is executed, information about the data and map is kept in a
workspace and is used as the input data is validated and the output data is built.
This workspace information can either be stored in files or written to memory.
A card’s WorkArea setting specifies whether to reuse that work area on
subsequent executions of the same map. If you are repeatedly going to run the
same map using the same input data more than once, setting the WorkArea card
setting value to Reuse increases the speed of map execution because data
validation for this input is not repeated. There are guidelines for reusing work
areas.
Value Description
Reuse Reuse the work area. After a map runs for the first time, the
work area that is created for the input card is not deleted.
Then, on subsequent executions of the same map, the data
for this input card is not validated, and the work area
information for the card is retrieved from the existing work
area.
!Reuse Do not reuse the work area. The input card’s WorkArea is
created for each map execution.