Teradata Parallel Data Pump

Chapter 2: Using Teradata TPump
Writing a Teradata TPump Job Script
into the target table. The UPDATE rows are selected based on criteria specified in a
conditional clause in the statement.
The DML command also allows UPDATE and INSERT statements to be paired to provide
Teradata TPump with an upsert capability. This allows Teradata TPump, in a single pass,
to attempt an UPDATE and, if it fails, perform an INSERT on the same row.
The DELETE statement removes entire rows from the target table whenever the evaluation
of the deleting condition is true, as specified in a conditional clause in the statement.
• The only information not yet provided in the task is the identity of the input data file, the
starting and ending records in the file that are being used in this task, and other related
information. This is done with the IMPORT command. This command basically tells the
Teradata TPump utility to bring in file X, from record A through record N, to associate the
layout name (and specifications) with the input records, and to apply the desired DML
(INSERT, UPDATE, and DELETE) statement to each record.
• The last command in the script is the END LOAD command. This command flags the end
of the commands and statements for the task, and triggers the program to begin execution
of the task.
For compatibility with the MultiLoad utility, multiple IMPORTs (up to four) are allowed
within a single BEGIN/END LOAD pair. However, because Teradata TPump does have an
apply phase, there is no significant difference between a script containing four BEGIN/
END LOAD pairs, each with one IMPORT, and a script with one BEGIN/END LOAD pair
and four IMPORTs.
Procedure for Writing a Script
A complete Teradata TPump job includes:
• Invoking Teradata TPump
• Logging onto Teradata Database and establishing the Teradata TPump support
environment
• Specifying the Teradata TPump tasks
• Logging off from Teradata Database and terminating Teradata TPump.
Use the following procedure as a guide for writing Teradata TPump job scripts:
Writing Teradata TPump Job Scripts
1 Invoke Teradata TPump, specifying the runtime options:
• Normal or abbreviated (brief) printout
• Number of buffers per session
• Character set
• Configuration file
• Periodicity rate
• Error logging function
• Macro save option
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