Data Warehousing

What is the difference between MultiLoad & Fastload interns of Performance?

FastLoad :

If you want to load, empty table then you use the fastload, so it will very useful than the MultiLoad ,because fastload performs the loading of the data in 2phase and its no need a work table for loading the data .

So it is faster as well as it follows the below steps to load the data in the table

Phase1 - It moves all the records to the entire AMP first without any hashing

Phase2 - After giving end loading command, Amp will hashes the record and send it to the appropriate AMPS.

MultiLoad:

It does the loading in the 5 phases

Phase1 - It will get the import file and checks the script

Phase2 - It reads the record from the base table and store in the work table

Phase3 - In this acquisition phase it locks the table header

Phase4 - In the DML operation will done in the tables

Phase5 - In this table locks will be released and work tables will be dropped.