Page 1 of 1
What is the difference between sequential file and Dataset
Posted: Fri Jan 25, 2008 5:32 am
by balu124
Hi ,
Can any one tell me the difference bet ween Sequential file and Dataset?
Can we delete the Dataset?Can we copy the Dataset?
Posted: Fri Jan 25, 2008 7:58 am
by RavishankarMS
I think better you refer Parallel job Developers Guide for detail info.
But to brief ,in DataStage job processing data flows in datasets format & DataSet stage is used to store the data in same raw format which could be viewed through DataStage View facility.
Whereas sequential files are flat files which stores data in readable UNIX format.
Re: What is the difference between sequential file and Datas
Posted: Fri Jan 25, 2008 8:01 am
by priyadarshikunal
balu124 wrote:Hi ,
Can any one tell me the difference bet ween Sequential file and Dataset?
Can we delete the Dataset?Can we copy the Dataset?
try to hit the search button first before posting a new topic
Posted: Sat Jan 26, 2008 12:50 am
by ray.wurlod
A Data Set is a parallel structure which stores data on all nodes on which processing is occurring. It preserves internal data types, partitioning and sorting. Indeed the operator used to move data between physical and virtual Data Sets is the copy operator.
Sequential files exist in only one place, and must be written to by exactly one process, so do not have any inherent parallelism capability. They usually contain text so must be read by an import operator and written by an export operator.