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Informatica Interview Questions Collection
What is the use of bitmap indexes?
Bitmap indexes are used to join large fact tables to smaller dimension tables.
How can we delete duplicate rows from flat files?
We can make use of sorter transformation and select distinct option.
If a session fails after loading 10000 records into the target how can we
start loading into the target from the 10001th record?
We can run the session with the recovery strategy mode.
What is the limit of joiner transformations?
We cannot use sequence generator or update strategy transformations before or
after joiner transformations.
How does server recognize the source and target databases?
By using ODBC if they are relational, FTP if they are flat files.
What is rank index in a group?
Power Center Designer automatically creates a RANK INDEX port while using
Rank transformation. The purpose of this RANK INDEX port is to store the
ranking for the column(s) we are interested in.
What are the constants or flags for each database operation and their
numeric equivalent in Update Strategy?
Insert DD_INSERT 0
Update DD_UPDATE 1
Delete DD_DELETE 2
Reject DD_REJECT 3
Can you generate reports using Informatica?
No, we cannot generate reports using Informatica, it is just an ETL tool but we
can generate metadata reports.
(SCD-2 by RamaSurReddy) Yes, Using Informatica Data Analyzer Tool we can
Can you start batches within a batch?
No, you can’t
What are the types of groups in Router Transformation?
There are three types of groups in Router Transformation namely
What are batches? What are the types of batches?
Batches provide a way to group sessions for either sequential or parallel
execution by Informatica server.
Concurrent batches – which run at the same time
Sequential batches – which run one after the other
What is Power Center Repository?
Power Center Repository allows you to share metadata among different
repositories and to create a datamart domain.
What r the types of metadata that stores in repository?
Differences between dynamic cache and static cache
In case of dynamic cache, if we want to insert a new row, then it will first looks in
the lookup cache and if the row is not present in the cache, it inserts the row into
the cache as well as target but in case of static cache, its stores only into target
table and not in cache.
What is the use of source qualifier?
Source qualifier is used to convert different data types to Informatica compatible
What is page code compatibility?
It is nothing but compatibility of code for maintaining data accuracy. It comes into
picture when data is in different languages.
What are Synonyms?
Synonyms are alternative names for database objects such as tables, views,
stored procedures etc.
Create [replace] synonym for [schema.]object_name