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WithoutBook LIVE Mock Interviews Informatica Related interview subjects: 13

Interview Questions and Answers

Know the top Informatica interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 48 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top Informatica interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Freshers / Beginner level questions & answers

Ques 5

What is the purpose of the Aggregator transformation?

The Aggregator transformation in Informatica is used to perform aggregate calculations such as sum, average, minimum, maximum, etc., on groups of data.
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Ques 10

Explain the concept of a Parameter File in Informatica.

A Parameter File in Informatica is a text file that contains parameter values used to replace placeholders in session and workflow properties at runtime.
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Ques 12

How can you create a reusable session in Informatica?

A reusable session in Informatica can be created by defining the session as reusable in the session properties and saving it to the repository for use in multiple workflows.
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Ques 14

Explain the concept of a Joiner transformation.

A Joiner transformation in Informatica is used to combine rows from two heterogeneous sources based on a common column, similar to an SQL join operation.
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Intermediate / 1 to 5 years experienced level questions & answers

Ques 15

Explain the difference between ETL and ELT.

ETL (Extract, Transform, Load) is a process where data is extracted from source systems, transformed, and then loaded into a data warehouse. ELT (Extract, Load, Transform) is a process where data is first extracted and loaded into the target system, and then transformations are applied.
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Ques 16

Explain the difference between a Mapping and a Mapplet.

A mapping is a set of source and target definitions linked by transformations, while a mapplet is a reusable object that contains a set of transformations.
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Ques 18

What is a Repository Service in Informatica?

The Repository Service in Informatica is responsible for managing connections to the repository and providing access to the metadata stored in the repository.
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Ques 21

What is the difference between a connected and an unconnected Lookup transformation?

A connected Lookup transformation is connected to the pipeline, while an unconnected Lookup is not connected to the pipeline and must be called by another transformation.
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Ques 22

How is parameterization achieved in Informatica?

Parameterization in Informatica is achieved through the use of parameter files, which contain values that can be substituted into session and workflow properties at runtime.
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Ques 24

How can you handle errors in Informatica?

Errors in Informatica can be handled using error handling strategies such as redirecting rows, terminating the session, or sending errors to a separate target.
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Ques 25

Explain the concept of a Normalizer transformation.

A Normalizer transformation in Informatica is used to convert columns with repeating groups into multiple rows, making data more readable and usable.
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Ques 26

Explain the concept of Data Transformation Manager (DTM) in Informatica.

The Data Transformation Manager (DTM) in Informatica is responsible for the execution of tasks within a session, such as reading, transforming, and loading data.
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Ques 27

How can you improve session performance in Informatica?

Session performance in Informatica can be improved by optimizing transformations, using partitioning, increasing cache size, and tuning session properties.
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Ques 28

How does Informatica handle incremental data loading?

Informatica handles incremental data loading by comparing source and target data based on a specified key and loading only the changed or new records.
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Ques 31

How can you handle slowly changing dimensions in Informatica?

Slowly Changing Dimensions (SCD) in Informatica can be handled using techniques such as Type 1 (overwrite), Type 2 (historical), and Type 3 (add new column).
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Ques 32

What is the purpose of a Target Load Plan in Informatica?

A Target Load Plan in Informatica specifies the order in which target tables are loaded, providing control over the loading sequence in a session.
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Ques 34

Explain the concept of a Surrogate Key in Informatica.

A Surrogate Key in Informatica is a system-generated key used to uniquely identify rows in a dimension table, often replacing natural keys for efficiency.
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Ques 35

What is the purpose of a Pre-Session Command in Informatica?

A Pre-Session Command in Informatica is used to execute commands or scripts before the session starts, allowing for custom initialization tasks.
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Ques 36

What is the purpose of a Data Masking transformation?

The Data Masking transformation in Informatica is used to mask sensitive data in a mapping, ensuring that confidential information is not exposed.
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Ques 38

What is the purpose of a Normalizer transformation in Informatica?

A Normalizer transformation in Informatica is used to transform data by converting columns with repeating groups into multiple rows, simplifying data processing.
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Experienced / Expert level questions & answers

Ques 39

Differentiate between static and dynamic cache in Informatica.

Static cache is populated at the beginning of a session and does not change during the session, while dynamic cache can be updated during the session.
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Ques 40

What is a Constraint-based Loading Order in Informatica?

Constraint-based loading order in Informatica ensures that data is loaded into the target in a specific order based on defined constraints between transformations.
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Ques 44

Explain the concept of a Data-driven session in Informatica.

In a Data-driven session in Informatica, the session properties and mappings are determined at runtime based on metadata, allowing dynamic control of the ETL process.
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Ques 45

What is the purpose of a Unconnected Stored Procedure transformation?

The Unconnected Stored Procedure transformation in Informatica is used to execute stored procedures that are not connected to the pipeline and do not return a value.
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Ques 46

Explain the concept of a Dynamic Partitioning in Informatica.

Dynamic Partitioning in Informatica allows the Informatica server to dynamically determine the number of partitions based on the available system resources.
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Ques 48

Explain the concept of a Source Filter in Informatica.

A Source Filter in Informatica is used to filter rows at the source database level before they are read by the source qualifier, optimizing data extraction.
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