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Abinitio Interview Questions & Answers - Learning Mode
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Abinitio Interview Questions & Answers - Learning Mode

The Ab Initio software is a fourth generation data analysis, batch processing, data manipulation graphical user interface (GUI)-based parallel processing tool which is commonly used to extract, transform and load data.

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Abinitio Interview Questions & Answers - Learning Mode
Try Abinitio Interview Questions & Answers - Exam Mode
Question: What are local and formal parameter?






Answer: Two are graph level parameters but in local you need to initialize the value at the time of declaration where as global no need to initialize the data it will promt at the time of running the graph for that parameter.<br> Source: CoolInterview.com
Question: How to work with parameterized graphs?



Answer: One of the main purpose of the parameterized graphs is that if we need to run the same graph for n number of times for different files, we set up the graph parameters like $INPUT_FILE, $OUTPUT_FILE etc and we supply the values for these in the Edit>parameters.These parameters are substituted during the run time. we can set different types of parameters like positional, keyword, local etc.

The idea here is, instead of maintaining different versions of the same graph, we can maintain one Source: CoolInterview.com
Question: what is BRODCASTING and REPLICATE ?



Answer: Broadcast - Takes data from multiple inputs, combines it and sends it to all the output ports.

Eg - You have 2 incoming flows (This can be data parallelism or component parallelism) on Broadcast component, one with 10 records & other with 20 records. Then on all the outgoing flows (it can be any number of flows) will have 10 + 20 = 30 records

Replicate - It replicates the data for a particular partition and send it out to multiple out ports of the component, but maintains the pa Source: CoolInterview.com
Question: How do you add default rules in transformer?

Answer: Click to transformer then go to edit ?then click to add default rule??

_______________________
Submitted by Nandy Chandan (cnandy@visa.com)


In Abinitio there is a concept called Rule Priority, in which you can assign priority to rules in Transformer.



Let?s have a example:



Ouput.var1 :1: input.var1 + 10

Ouput.var1 :2: 100



This example shows that output variable is assigned an input var Source: CoolInterview.com
Question: What is the use of aggregation when we have rollup
as we know rollup component in abinitio is used to summirize group of data record. then where we will use aggregation ?





Answer: Aggregation and Rollup both can summerise the data but rollup is much more convenient to use. In order to understand how a particular summerisation being rollup is much more explanatory compared to aggregate. Rollup can do some other functionalities like input and output filtering of records. Source: CoolInterview.com
Question: How many parallelisms are in Abinitio? Please give a definition of each.

Answer: TYPES OF PARALLELISM—

There are 3 types of parallelism in ab-initio.

1) Data Parallelism: Data is processed at the different servers at the same time.

2) Pipeline parallelism: In this the records are processed in pipeline, i.e. the components do not have to wait for all the records to be processed. The records that got processed are passed to next component in pipeline.

3) Component Parallelism: In this two or more components process the records in Source: CoolInterview.com
Question: What is a cursor? Within a cursor, how would you update fields on the row just fetched?



Answer: The oracle engine uses work areas for internal processing in order to the execute sql statement is called cursor.There are two types of cursors like Implecit cursor and Explicit cursor.Implicit cursor is using for internal processing and Explicit cursor is using for user open for data required. Source: CoolInterview.com
Question:

Explain the differences between api and utility mode?




Answer: API and UTILITY are the two possible interfaces to connect to the databases to perform certain user specific tasks. These interfaces allows the user to access or use certain functions (provided by the database vendor) to perform operation on the databases.The functionality of each of these interfaces depends on the databases.

API has more flexibility but often considered as a slower process as compared to UTILITY mode. Well the trade off is their performance and usage.
Source: CoolInterview.com
Question: What are differences between different GDE versions(1.10,1.11,1.12,1.13and 1.15)?
What are differences between different versions of Co-op?



Answer: 1.10 is a non key version and rest are key versions.

There are lot of components added and revised at following versions.
Source: CoolInterview.com
Question: How Does MAXCORE works?



Answer: Maxcore is a value (it will be in Kb).Whne ever a component is executed it will take that much memeory we specified for execution Source: CoolInterview.com
Question: What does dependency analysis mean in Ab Initio?



Answer: Dependency analysis will answer the questions regarding datalinage.that is where does the data come from,what applications prodeuce and depend on this data etc.. Source: CoolInterview.com
Question: What is the importance of EME in abinitio?



Answer: EME is a repository in Ab Inition and it used for checkin and checkout for graphs also maintains graph version. Source: CoolInterview.com
Question: How to create a computer program that computes the monthly interest charge on a credit card account????

Answer: No answer available currently.
Question: What is the Difference between DML Expression and XFR Expression ?



Answer: The main difference b/w dml & xfr is that

DML represent format of the metadata.

XFR represent the tranform functions.which will contain business rules


Source: CoolInterview.com
Question: When using multiple DML statements to perform a single unit of work, is it preferable to use implicit or explicit transactions, and why.



Answer: Because implicit is using for internal processing and explicit is using for user open data requied.

Source: CoolInterview.com
Question: Please let me know whether we have ab initio
GDE version 1.14 and what is the latest GDE
version and Co-op version?



Answer: Yes, Ab Initio GDE 1.14.7 is the latest version with some of the additional features which replaces the DTM plans in the older versions.

Source: CoolInterview.com
Question: Explain what is lookup?



Answer: Lookup is basically a specific dataset which is keyed. This can be used to mapping values as per the data present in a particular file (serial/multi file). The dataset can be static as well dynamic ( in case the lookup file is being generated in previous phase and used as lookup file in current phase). Sometimes, hash-joins can be replaced by using reformat and lookup if one of the input to the join contains less number of records with slim record length.

AbInitio has built-in functions t Source: CoolInterview.com
Question: What is driving port? When do you use it?



Answer: When you set the sorted-input parameter of "JOIN" component to "In memory: Input need not be sorted", you can find the driving port.
Generally driving port use to improve performance in a graph.

The driving input is the largest input. All other inputs are read into memory.

For example, suppose the largest input to be joined is on the in1 port. Specify a port number of 1 as the value of the driving parameter. The component reads all other inputs to the join ? for example, in0, Source: CoolInterview.com
Question: What is the difference between a DB config and a CFG file?

Answer: A .dbc file has the information required for Ab Initio to connect to the database to extract or load tables or views. While .CFG file is the table configuration file created by db_config while using components like Load DB Table. Source: CoolInterview.com
Question: Difference between conventional loading and direct loading ? when it is used in real time .



Answer: Conventional Load:
Before loading the data, all the Table constraints will be checked against the data.

Direct load:(Faster Loading)
All the Constraints will be disabled. Data will be loaded directly.Later the data will be checked against the table constraints and the bad data won't be indexed.

Api conventional loading

utility direct loading.
Source: CoolInterview.com

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