Why we need datasets ratherthan sequential files?
Answers were Sorted based on User's Feedback
Answer / sagar
When you use sequential file as Source,at the time of
compilation it will convert to native format from
ASCII.where as,when you go for using datasets... conversion
is not required.Also, by default sequenctila files we be
processed in sequenc only.sequential files can accommodate
up to 2GB only.sequentila files does not support NULL
values....all the above can me overcome using dataset
stage....but selection is depeneds on the
requirement....suppose if you want to capture rejected
data....in that case you need to use sequential file or
fileset stage....
Is This Answer Correct ? | 22 Yes | 4 No |
Answer / kiran
First we Know about Seq file and Dataset.
Seg file is used Extract the from flatfiles and load into
flatfiles and limit is 2GB
Dataset is a intermidiate stage and it has paralism when
load data into dataset and it inprove the performanece.
Is This Answer Correct ? | 22 Yes | 11 No |
Answer / chiranjeevi.a
To over come the limitation of sequential file,espesially
sequential file: By default reads and writes sequentially
>memory limit is up to 2GB
>conversion is needed
>sourse stores the data out side of datastage
Data file:
>parallel process
>memory is unlimited
>No conversion is needed while reading the data(its
basically in native format).
>stores data inside the repositary
Is This Answer Correct ? | 11 Yes | 2 No |
Answer / narayana
file set is nothing but collection of sequential files. if sourse database is greater than 2 GB than prefer to use file set.
Data set is internal stage in datastage.the extension of data set is .ds it never used to extract data from client location .it is used as intermediate stage between two tables.
Sequential : 1)it supports all formats like txt,csv,xls,etc.
2)it is used to extract data from flat files from client location.
Data set:1)it supports only .ds format
2)it will never extract data from flat files from client location.
Is This Answer Correct ? | 4 Yes | 2 No |
Answer / pavan
datasets get processed in our local system rather than at
the server so performance gets enhanced in this case as
server is not loaded.
Is This Answer Correct ? | 0 Yes | 13 No |
How can we run same job in 1 day 2 times
how to connect source to db?generally what r stages u used? how to find the data is having delimiter format?
I have load a Dataset in UAT with 2 Node configuration, imported the job into PROD environment which is 4 node configuration and using this DataSet as SRC to other job. will the job run fine or give any errors? If job runs fine, on how many nodes? 2 nodes or 4 nodes?
What are the unit test cases you used in your project?
Tell me Wt main advantage of Stage varibles? Project level hints?
What is diff between Junk dimensions and conform dimension?
Please tell me What is difference between 8.0 and 8.1
client know skid info?
What are the different type of jobs in datastage?
which unix commands mostly used in datastage
I have 100 records how can I load at a time from the single time
1)What is configuration your file structure 2)I have two databases both are Oracle while loading data from source to target the job takes 30 min but I want to load less time how?