Informatica Interview Questions and Answers

4/05/2010 No Comment
Overview:Informatica Interview Questions Answers,Informatica Job Interview Questions and Solutions,Informatica Tool Interview Questions,Informatica Interview Questions with Answers

What are the types of loading in Informatica?
There are two types of loading, normal loading and bulk loading. In normal loading, it loads record by record and writes log for that. It takes comparatively a longer time to load data to the target in normal loading. But in bulk loading, it loads number of records at a time to target database. It takes less time to load data to target.

What is aggregate cache in aggregator transformation?
The aggregator stores data in the aggregate cache until it completes aggregate calculations. When you run a session that uses an aggregator transformation,the Informatica server creates index and data caches in memory to process the transformation. If the Informatica server requires more space, it stores overflow values in cache files.

Define Informatica repository?
Infromatica Repository:The Informatica repository is at the center of the Informatica suite. You create a set of metadata tables within the repository database that the Informatica application and tools access. The Informatica client and server access the repository to save and retrieve metadata.

What are the tasks that source qualifier performs?
Join data originating from same source data base. Filter records when the informatica server reads source data. Specify an outer join rather than the default inner join specify sorted records. Select only distinct values from the source. Creating custom query to issue a special SELECT statement for the informatica server to read source data.

What is the target load order?
Specify the target load order based on source qualifiers in a mapping. If you have the multiple source qualifiers connected to the multiple targets you can designate the order in which informatica server loads data into the targets.

How Union Transformation is used?
The union transformation is a multiple input group transformation that can be used to merge data from various sources (or pipelines). This transformation works just like UNION ALL statement in SQL, that is used to combine result set of two SELECT statements.

Can two flat files be joined with Joiner Transformation?
Yes, joiner transformation can be used to join data from two flat file sources.

What is a look up transformation?
This transformation is used to lookup data in a flat file or a relational table, view or synonym. It compares lookup transformation ports (input ports) to the source column values based on the lookup condition. Later returned values can be passed to other transformations.

Can a lookup be done on Flat Files?

Which transformation should you need while using the cobol sources as source defintions?
Normalizer transformaiton which is used to normalize the data.Since cobol sources are oftenly consists of Denormailzed data.

What is the difference between a connected look up and unconnected look up?
Connected lookup takes input values directly from other transformations in the pipleline.
Unconnected lookup doesnt take inputs directly from any other transformation, but it can be used in any transformation (like expression) and can be invoked as a function using :LKP expression. So, an unconnected lookup can be called multiple times in a mapping.

What are the types of data that passes between informatica server and stored procedure?
3 types of data
• Input/Out put parameters
• Return Values
• Status code.

What is the status code?
Status code provides error handling for the informatica server during the session. The stored procedure issues a status code that notifies whether or not stored procedure completed sucessfully.This value can not seen by the user. It only used by the informatica server to determine whether to continue running the session or stop.

What is source qualifier transformation?
When you add a relational or a flat file source definition to a mapping, you need to connect it to a source qualifier transformation. The source qualifier transformation represents the records that the informatica server reads when it runs a session.
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