Teradata Parallel Data Pump

Chapter 2: Using Teradata TPump
Estimating Space Requirements
LogDB = :LogDB AND
Import = :Import AND
LogTable = :LogTable
);
; UPDATE SysAdmin.TPumpStatusTbl
SET
RequestChange = :RequestChange,
StmtsUnLimited = :StmtsUnLimited,
StmtsDesired = :StmtsDesired,
PeriodsDesired = :PeriodsDesired
WHERE
UserName = USER AND
LogDB = :LogDB AND
LogTable = :LogTable AND
Import = :Import ;
Estimating Space Requirements
This section discusses space requirements for the Teradata TPump log table.
A row of approximately 200 bytes is written to the log table on each of the following events.
• One row is written at initialization.
• One row is written for each SQL statement issued through the Teradata TPump support
environment.
• One row is written at the BEGIN LOAD command.
• One row is written at the END LOAD command.
• Two rows are written for each IMPORT command.
• One row is written for each statement used in a load (between the BEGIN LOAD
command and the END LOAD command).
• One row is written for each checkpoint taken.
• In the ROBUST mode, for each packed request, a number of partial checkpoint rows are
written to the log between checkpoints. The rows are deleted each time a checkpoint is
written.
The partial checkpoint row contains 117 + (12 * packfactor) bytes per transaction. So the
number of partial checkpoints will vary, depending on the checkpoint frequency, the power of
the loading host, and the power of the Teradata target database.
Thus, an equation for the space is:
200 + 200 * each statement in the support environment + 400 * each BEGIN/END LOAD +
200 * each statement issued as DML + 200 * the estimated number of checkpoints + (117 +
(12 * packfactor)) * the number of partial checkpoints. A simplified version would be:
R = 200 + 200S + 400L + 200D + 200C + (117 + (12P))N,
where:
R = Required space for Teradata TPump log table
Teradata Parallel Data Pump Reference 85