Interested to Buy Any Domain ? << Click Here >> for more details...
What is difference between partioning of relatonal target
and partitioning of file targets?
- 2 Answers
- 13957 Views
- I also Faced
- E-Mail Answers
Answer Posted / isha_gtb
How to Partition Flat files?
Sessions can run on single or multiple nodes (in a grid). Row distribution depends on two factors –
Number of Threads
Number of Partitions
A. Flatfile Sources
Partitioning allowed for both Direct and Indirect type Flat file sources
Some Source Qualifier transformation with subsequent transformations like Joiner transformation (configured with sorted input) require sorted row order.
It is important to preserve the row order while distributing rows between partitions. This is to be achieved by setting an appropriate value for “Concurrent Read Partitioning” in Session properties.
B. Flatfile Targets
While writing a target, you can configure Informatica to write to different files one for each partition or you can configure to write data concurrently.
All these files can be merged to one file when the process completes as indicated in the merge type
To merge the files, you can either set below properties / write a post session command – Merge Type, Merge File Directory, Merge File Name
Informatica allow you to merge the target files in three different ways –
Sequential Merge – Informatica creates one output file for each partition and sequentially merge them to a single file when the session completes
Concurrent Merge – Informatica writes the output data for all partitions concurrently on to one merge file. Sorting order will not be preserved in this type of merge
File List – Informatica creates and write one output file for each partition and write the file directory and file name to a separate list file.
Ref :
http://etllabs.com/informatica/informatica-partitions/4810/
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
What are the measure objects?
Explain constraint based loading in informatica
What is the need of etl tools?
Separate from an archive server and a powerhouse?
What is decode in static cache?
How you know when to use a static cache and dynamic cache in lookup transformation?
can anyone explain me about retail domain project in informatica?
What is option by which we can run all the sessions in a batch simultaneously?
Explain target update override in informatica
Why union transformation is an active transformation?
how to create user defined function (udf) in informatica
What are the prerequisite tasks to achieve the session partition?
What is informatica etl tool?
Explain how many types of dimensions are available in informatica?
if i hv 6 table as source table but can i make 12 as a dim table and 6 as fact table belongs to that src table.
