Here I have collected some qood interview questions with answers about Informatica that is generally asked. Download Complete Questions in PDF. It will be. Upon completion the Informatica server stores the end value of a variable and is reused when session restarts. Moreover those values that do. Informatica Interview Questions | Advanced Technical Topics | For freshers & Professionals | Free Practice Test Informatica Interview Questions And Answers.

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Informatica Interview Questions and - Download as Word Doc . doc /.docx), PDF File .pdf), Text File .txt) or read online. Frequently asked Informatica Interview Questions with detailed answers and examples. Tips and Tricks for cracking Informatica interview. Happy Informatica job. Contains Important Informatica Interview Questions with Answers and Informatica and Answers PDF | Informatica eBooks | Informatica | What is Informatica?.

How many repositories can be created in informatica? There can be any number of repositories in informatica but eventually it depends on number of ports.

What is the benefit of partitioning a session? Partitioning a session means solo implementation sequences within the session. It's main purpose is to improve server's operation and efficiency.

Other transformations including extractions and other outputs of single partitions are carried out in parallel.

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How are indexes created after completing the load process? For the purpose of creating indexes after the load process, command tasks at session level can be used. Index creating scripts can be brought in line with the session's workflow or the post session implementation sequence.

Moreover this type of index creation cannot be controlled after the load process at transformation level. Explain sessions. Explain how batches are used to combine executions? A teaching set that needs to be implemented to convert data from a source to a target is called a session. Session can be carried out using the session's manager or pmcmd command.

Batch execution can be used to combine sessions executions either in serial manner or in a parallel. Batches can have different sessions carrying forward in a parallel or serial manner. How many number of sessions can one group in batches? One can group any number of sessions but it would be easier for migration if the number of sessions are lesser in a batch.

Explain the difference between mapping parameter and mapping variable?

Informatica Interview Question and Answers

When values change during the session's execution it's called a mapping variable. Upon completion the Informatica server stores the end value of a variable and is reused when session restarts. Moreover those values that do not change during the sessions execution are called mapping parameters. Mapping procedure explains mapping parameters and their usage.

Values are allocated to these parameters before starting the session.

What is complex mapping? Following are the features of complex mapping. Difficult requirements Many numbers of transformations Complex business logic How can one identify whether mapping is correct or not without connecting session? One can find whether the session is correct or not without connecting the session is with the help of debugging option. Can one use mapping parameter or variables created in one mapping into any other reusable transformation? Yes, One can do because reusable transformation does not contain any mapplet or mapping.

Explain the use of aggregator cache file? Aggregator transformations are handled in chunks of instructions during each run. It stores transitional values which are found in local buffer memory. Aggregators provides extra cache files for storing the transformation values if extra memory is required. Briefly describe lookup transformation? The server makes the access faster by using the lookup tables to look at explicit table data or the database. Concluding data is achieved by matching the look up condition for all look up ports delivered during transformations.

What does role playing dimension mean? The dimensions that are utilized for playing diversified roles while remaining in the same database domain are called role playing dimensions.

Informatica Interview Questions and Answers.pdf

How can repository reports be accessed without SQL or other transformations? Repositoryreports are established by metadata reporter. There is no need of SQL or other transformation since it is a web app. What are the types of metadata that stores in repository? The types of metadata includes Source definition, Target definition, Mappings, Mapplet, Transformations. Explain the code page compatibility?

When data moves from one code page to another provided that both code pages have the same character sets then data loss cannot occur. All the characteristics of source page must be available in the target page. Moreover if all the characters of source page are not present in the target page then it would be a subset and data loss will definitely occur during transformation due the fact the two code pages are not compatible.

How can you validate all mappings in the repository simultaneously? All the mappings cannot be validated simultaneously because each time only one mapping can be validated.

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Briefly explain the Aggregator transformation? It allows one to do aggregate calculations such as sums, averages etc. It is unlike expression transformation in which one can do calculations in groups. Describe Expression transformation?

Values can be calculated in single row before writing on the target in this form of transformation. It can be used to perform non aggregate calculations.

Conditional statements can also be tested before output results go to target tables. What do you mean by filter transformation? It is a medium of filtering rows in a mapping. Data needs to be transformed through filter transformation and then filter condition is applied. What is Joiner transformation? Joiner transformation combines two affiliated heterogeneous sources living in different locations while a source qualifier transformation can combine data emerging from a common source.

What is Lookup transformation? It is used for looking up data in a relational table through mapping. Lookup definition from any relational database is imported from a source which has tendency of connecting client and server. One can use multiple lookup transformation in a mapping. How Union Transformation is used?

It is a diverse input group transformation which can be used to combine data from different sources. What do you mean Incremental Aggregation? Option for incremental aggregation is enabled whenever a session is created for a mapping aggregate.

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Power center performs incremental aggregation through the mapping and historical cache data to perform new aggregation calculations incrementally. What is the difference between a connected look up and unconnected look up? When the inputs are taken directly from other transformations in the pipeline it is called connected lookup.

While unconnected lookup doesn't take inputs directly from other transformations, but it can be used in any transformations and can be raised as a function using LKP expression. So it can be said that an unconnected lookup can be called multiple times in mapping.

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What is a mapplet? A recyclable object that is using mapplet designer is called a mapplet. The entire mapping should look like this.

This will give us the top 3 employees earning maximum salary in their respective departments. Factless Fact Table: SCD Type3 Mapping. It stores one time historical data with current data. Entire mapping will look like this. We are calling the unconnected lookup from one expression transformation. Below is the screen shot of the expression transformation. After execution of the above mapping, below is the target, that is populated.

Informatica Interview Questions for Beginners.The server makes the access faster by using the lookup tables to look at explicit table data or the database. How we can access repository reports without SQL or other transformations? This specific task permits one or more than one shell commands in Unix or DOS in windows to run during the workflow. Yes, One can do because reusable transformation does not contain any mapplet or mapping. It is a medium of filtering rows in a mapping.

This data can be reused and analyzed at regular intervals or as per the need of the time requirement. This can either be local or global repository but it allows version control for the repository. Q26 Define workflow? We can configure the lookup transformation to Cache the lookup data or directly query the lookup source every time the lookup is invoked.