MultiLoad lets you to upload data from the client to your Vantage system. MultiLoad operates on multiple tables simultaneously and can also insert, update, and delete data.
The maximum number of MultiLoad jobs you can run is 30. The default is 5. (See Maximum Number of Concurrent FastLoad, MultiLoad, and FastExport Jobs for more information.)
To improve performance, do the following:
- Minimize concatenation and redefinition of input data.
- Restrict the number of NUSIs.
- Make the PI of each data table unique or nearly unique.
- Minimize the use of error tables.
- Do not checkpoint too often.
- Minimize the number of sessions.
MultiLoad does not support the following:
- Aggregate operators
- Exponential operators
- Arithmetic functions
- Concatenation of data files
- Hexadecimal forms
- NoPI tables
- Foreign keys
- Loading LOBs
- Column-partitioned tables
For more information, see Teradata® MultiLoad Reference, B035-2409.
You can do these steps as an alternative to using MultiLoad:
- Create a staging table that is otherwise identical with the target table, but has no constraints, triggers, or indexes defined on it, such as a NoPI.
- Import into the staging table from the external source (for example, using FastLoad or Teradata Parallel Data Pump Array INSERT operations).
- (Optional) create an error table for the target table if error logging is desired.
- Run a MERGE into the target table using the staging table as source.
- Drop the staging table and error table.
For information on NoPI tables or Teradata Parallel Data Pump Array INSERT operations, see NoPI Tables, Column-Partitioned NoPI Tables, and Column-Partitioned NoPI Join Indexes.
Related Information
| Topic | Reference |
|---|---|
| MERGE | MERGE |