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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: How do you connect EME to Abinitio Server?

Answer:
Question: How many parallelisms are in Abinitio? Please give a definition of each.

Answer: TYPES OF PARALLELISMó

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: Why might you create a stored procedure with the 'with recompile' option?



Answer: Recompile is useful when the tables referenced by the stored proc undergoes a lot of modification/deletion/addition of data. Due to the heavy modification activity the execute plan becomes outdated and hence the stored proc performance goes down. If we create the stored proc with recompile option, the sql server wont cache a plan for this stored proc and it will be recompiled every time it is run. 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 m_dump



Answer: m_dump command prints the data in a formatted way.

m_dump <dml> <file.dat>
Source: CoolInterview.com
Question: How to Create Surrogate Key using Ab Initio?



Answer: There r many ways to create Surrogatekey but it depends on your business logic. here u can try these ways...

1. use next_in_sequence() function in your transform.

2.use Assign key values component (if ur gde is higher than 1.10)

3.write a stored proc to this and call this stor proc wherever u need

Source: CoolInterview.com
Question: What is the difference between sandbox and EME, can we perform checkin and checkout through sandbox/ Can anybody explain checkin and checkout?


Answer: Sandboxes are work areas used to develop, test or run code associated with a given project. Only one version of the code can be held within the sandbox at any time.
The EME Datastore contains all versions of the code that have been checked into it. A particular sandbox is associated with only one Project where as a Project can be checked out to a number of sandboxes 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 data mapping and data modelling?



Answer: data mapping deals with the transformation of the extracted data at FIELD level i.e. the transformation of the source field to target field is specified by the mapping defined on the target field. The data mapping is specified during the cleansing of the data to be loaded.

For Example:

source;

string(35) name = "Siva Krishna ";

target;

string("01") nm=NULL("");/*(maximum length is string(35))*/

Then we can have a mapping like:

Straight move.T Source: CoolInterview.com
Question: what is difference between file and table in abinitio

Answer: Table means it maintaince relational data i.e it is a relational structure.
File means non relation structure.
it maintaince data.


Source: CoolInterview.com
Question: Can we load multiple files?






Answer: Load multiple files from my perspective means writing into more than one file at a time. If this is the same case with you, Ab initio provides a component called Write Multiplefiles (in dataset Component group) which can write multiple files at a time. But the files which are to be written must be local files i.e., they should reside in your local PC. For more information on this component read in help file.

Source: CoolInterview.com
Question: What are the contineous components in Abinitio?



Answer: Contineous components used to create graphs,that produce useful output file while running continously

Ex:- Contineous rollup,Contineous update,batch subscribe
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 .abinitiorc and What it contain?



Answer: .abinitiorc is the config file for ab initio. It is found in user's home directory. Generally it is used to contain abinitio home path, different log in information like id encrypted password login method for hosts where the graph connects in time of execution.

It may contain inf like EME host and others.
Source: CoolInterview.com
Question: How to create repository in abinitio for stand alone system(LOCAL NT)?



Answer: If you are trying to install the Ab -Initio on stand alone machine , then it is not necessary to create the repository , While installing It creates automatically for you under abinitio folder ( where you installing the Ab-Initio) If you are still not clear please ask your Question on the same portal Source: CoolInterview.com
Question: How would you do performance tuning for already built graph ? Can you let me know some examples?



Answer: example :- suppose sort is used in fornt of merge component its no use of using sort ! bcz we hv sort component built in merge.

2) we use lookup instead of JOIN,Merge Componenet.

3) suppose we wnt to join the data comming from 2 files and we dnt wnt dupliates we will use union funtion instead of adding addtional component for duplicate remover.

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 is the purpose of having stored procedures in a database?



Answer: Main Purpose of Stored Procedure for reduse the network trafic and all sql statement executing in cursor so speed too high.
Source: CoolInterview.com
Question: What is the difference between partitioning with key and round robin?

Answer: PARTITION BY KEY:

In this, we have to specify the key based on which the partition will occur. Since it is key based it results in very well balanced data. It is useful for key dependent parallelism.



PARTITION BY ROUND ROBIN:

In this, the records are partitioned in sequential way, distributing data evenly in blocksize chunks across the output partition. It is not key based and results in well balanced data especially w Source: CoolInterview.com
Question: How do you truncate a table? (Each candidate would say only 1 of the several ways to do this.)

Answer: There are many ways to do it.
1. Probably the easiest way is to use Truncate Table
2. Run Sql or update table can be used to do the same thing
3. Run Program

_________________
Submitted by Kalyan Samaddar (ccev56@nus.edu.sg) Source: CoolInterview.com

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