Sponsored Links

Interview Questions
Recommended Books

Question :

What is the exact difference betwwen Join,Merge and Lookup Stage??

Category DataStage Interview Questions
Rating (3.0) By 12 users
Added on 7/26/2011
Views 635
Rate it!

Highly Recommended, Hand Picked DataStage Books

Question :

What is the exact difference betwwen Join,Merge and Lookup Stage??


The exact difference between Join,Merge and lookup is

The three stages differ mainly in the memory they use

DataStage doesn't know how large your data is, so cannot make an informed choice whether to combine data using a join stage or a lookup stage. Here's how to decide which to use:

if the reference datasets are big enough to cause trouble, use a join. A join does a high-speed sort on the driving and reference datasets. This can involve I/O if the data is big enough, but the I/O is all highly optimized and sequential. Once the sort is over the join processing is very fast and never involves paging or other I/O

Unlike Join stages and Lookup stages, the Merge stage allows you to specify several reject links as many as input links.

Source: CoolInterview.com

The three stages differs with each other with respect to
1>Input Requirements
2>Treatment of unmatched records
3>Memory Usage

Join requires less memory usage
Lookup requires more memory usage and
Merge requires less memory usage

To know more differences, you can mail me. There are almost 12 differences that i can explain you

Source: CoolInterview.com

Posted by: Vishwanath

Contact Vishwanath Contact Vishwanath

If you have the better answer, then send it to us. We will display your answer after the approval.
Rules to Post Answers in CoolInterview.com:-
  • There should not be any Spelling Mistakes.
  • There should not be any Gramatical Errors.
  • Answers must not contain any bad words.
  • Answers should not be the repeat of same answer, already approved.
  • Answer should be complete in itself.
Name :*
Email Id :*
Answer :*
Verification Code Code Image - Please contact webmaster if you have problems seeing this image code Not readable? Load New Code
Process Verification Enter the above shown code: *
Inform me about updated answers to this question

Related Questions
View Answer
There are three different types of user-created stages available for PX.
What are they? Which would you use? What are the disadvantage for using each type?

View Answer
What user varibale activity when it used how it used !where it is used with real example

View Answer
DataStage from Staging to MDW is only running at 1 row per second! What do we do to remedy?

View Answer
What is the difference between datastage and informatica

View Answer
How is datastage 4.0 functionally different from the enterprise edition now?? what are the exact changes?

View Answer
What are orabulk and bcp stages?

View Answer
How to handle the rejected rows in datastage?

View Answer
It is possible to run parallel jobs in server jobs?

View Answer
What are the differences between the data stage 7.0 and 7.5
in server jobs?

View Answer
How the hash file is doing lookup in serverjobs?How is it comparing the key values?

View Answer
What is data set? and what is file set?

View Answer
What are the enhancements made in datastage 7.5 compare with 7.0

View Answer
If I add a new environment variable in Windows, how can I access it in DataStage?

View Answer
1.What about System variables?
2.How can we create Containers?
3.How can we improve the performance of DataStage?
4.what are the Job parameters?
5.what is the difference between routine and transform and function?
6.What are all the third party tools used in DataStage?
7.How can we implement Lookup in DataStage Server jobs?
8.How can we implement Slowly Changing Dimensions in DataStage?.
9.How can we join one Oracle source and Sequential file?.
10.What is iconv and oconv functions?
11.Difference between Hashfile and Sequential File?
12. Maximum how many characters we can give for a Job name in DataStage?

View Answer
It is possible to call one job in another job in server jobs?

View Answer
What is hashing algorithm and explain breafly how it works?

View Answer
If a DataStage job aborts after say 1000 records, how to continue the job from 1000th record after fixing the error?

View Answer
How to implement type2 slowly changing dimensions in data stage?explain with example?

View Answer
Is it possible to move the data from oracle ware house to SAP Warehouse using with DATASTAGE Tool.

View Answer
How much would be the size of the database in DataStage ?
What is the difference between Inprocess and Interprocess ?

View Answer

Please Note: We keep on updating better answers to this site. In case you are looking for Jobs, Pls Click Here Vyoms.com - Best Freshers & Experienced Jobs Website.

View ALL DataStage Interview Questions & Answers

User Options
India News Network

Latest 20 Questions
What are the Hadoop related Projects at Apache?
What are the modules included in Apache Hadoop Project?
What is Apache Hadoop?
What is a Private Cloud? Do we need one to handle Big Data?
How Can We Cope with the Impact of Big Data?
What skills do Big Data analysts need to have?
What does a Big Data analyst do?
What are some real-world examples of Big Data and how it is used?
What is Big Data Analytics?
Why Big Data is becoming so important?
What is the impact of Big Data on Sports Industry?
What is the impact of Big Data on Real estate Industry?
What is the impact of Big Data on Retail Banking Industry?
What is the impact of Big Data on Retail Industry?
What is the impact of Big Data on Technology Industry?
What is the impact of Big Data on Information Technology Industry?
What is the impact of Big Data on Internet of Things (IoT) Industry?
What is the impact of Big Data on Media Industry?
What is the impact of Big Data on Education Industry?
What is the impact of Big Data on Healthcare Industry?

Fresher Jobs | Experienced Jobs | Government Jobs | Walkin Jobs | Company Profiles | Interview Questions | Placement Papers | Companies In India | Consultants In India | Colleges In India | Exams In India | Latest Results | Notifications In India | Call Centers In India | Training Institutes In India | Job Communities In India | Courses In India | Jobs by Keyskills | Jobs by Functional Areas

Testing Articles | Testing Books | Testing Certifications | Testing FAQs | Testing Downloads | Testing Interview Questions | Testing Jobs | Testing Training Institutes

Gate Articles | Gate Books | Gate Colleges | Gate Downloads | Gate Faqs | Gate Jobs | Gate News | Gate Sample Papers | Gate Training Institutes

MBA Articles | MBA Books | MBA Case Studies | MBA Business Schools | MBA Current Affairs | MBA Downloads | MBA Events | MBA Notifications | MBA FAQs | MBA Jobs
MBA Job Consultants | MBA News | MBA Results | MBA Courses | MBA Sample Papers | MBA Interview Questions | MBA Training Institutes

GRE Articles | GRE Books | GRE Colleges | GRE Downloads | GRE Events | GRE FAQs | GRE News | GRE Training Institutes | GRE Sample Papers

IAS Articles | IAS Books | IAS Current Affairs | IAS Downloads | IAS Events | IAS FAQs | IAS News | IAS Notifications | IAS UPSC Jobs | IAS Previous Question Papers
IAS Results | IAS Sample Papers | IAS Interview Questions | IAS Training Institutes | IAS Toppers Interview

SAP Articles | SAP Books | SAP Certifications | SAP Companies | SAP Study Materials | SAP Events | SAP FAQs | SAP Jobs | SAP Job Consultants
SAP Links | SAP News | SAP Sample Papers | SAP Interview Questions | SAP Training Institutes |

Copyright ©2003-2016 CoolInterview.com, All Rights Reserved.
Privacy Policy | Terms and Conditions

Cache = 0.82605 Seconds