Data Transformation Engine Map Designer Reference Guide

Chapter 10 - Map Settings WorkSpace Settings
Map Designer Reference Guide
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When a map is run, a paging scheme to access information about the data as
efficiently as possible is used. Portions of both working data and actual data are
paged, as needed. The workspace can be a combination of files and memory, or
simply memory-based. When file-based workspace is used, the amount of
memory accessed at a given time depends on the number of pages and the count
of pages configured for a map to run.
The WorkSpace settings specify the location (file or memory) of the workspace
and PageSize and PageCount settings for configuring the page size.
The default value for the Location setting is File.
Value Description
File A work file is created for each input card. Use the Directory
setting to specify the directory.
Memory A memory-based workspace is created.
The WorkSpace settings allow you to optimize the speed of map processing.
♦ When the size of the input data a map is processing is large, file-based
workspace using default paging is recommended (Workspace = File).
♦ When small amounts of data are processed, smaller page sizes and memory-
based workspace is recommended (Workspace = Memory).
♦ When using burst processing, adjust the workspace configuration for the size of
burst data.
Note If a particular map card is not referenced by any map rules, no work area for that
card will be created, and the audit log will indicate that the work area is not found.
PageSize
The PageSize setting specifies the size of a memory page to be used for work
files. For maps that include a large number of type references, you may want to
increase the page size. The default value for the PageSize setting is 64.
Value Description
n
Enter a number that represents the size of a memory page in
kilobytes. The page size should be a multiple of 2, between 2
and 1024.