Ab Initio Data Warehousing Interview Questions and Answers
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Ab Initio Questions and Answers:

1 :: How to get DML using Utilities in UNIX?

If your source is a cobol copybook, then we have a command in unix which generates the required in Ab Initio. here it is:

cobol-to-dml.
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2 :: What is skew and skew measurement?

skew is the mesaureof data flow to each partation .

suppose i/p is comming from 4 files and size is 1 gb

1 gb= ( 100mb+200mb+300mb+5oomb)

1000mb/4= 250 mb

(100- 250 )/500= --> -150/500 == cal ur self it wil come in -ve value.

calclu for 200,500,300.

+ve value of skew is allways desriable.

skew is a indericet measure of graph.
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3 :: What is the difference between a Scan component and a RollUp component?

Rollup is for group by and Scan is for successive total. Basically, when we need to produce summary then we use scan. Rollup is used to aggregate data.
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4 :: What is m_dump?

m_dump command prints the data in a formatted way.

m_dump <dml> <file.dat>
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5 :: What is the importance of EME in abinitio?

EME is a repository in Ab Inition and it used for checkin and checkout for graphs also maintains graph version.
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