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Informatica Interview Questions
What are the differences between Connected and Unconnected Lookup?
The differences are illustrated in the below table
Connected Lookup Unconnected Lookup
Connected lookup participates in Unconnected lookup receives input
dataflow and receives input directly values from the result of a LKP:
from the pipeline expression in another transformation
Connected lookup can use both Unconnected Lookup cache can NOT
dynamic and static cache be dynamic
Connected lookup can return more Unconnected Lookup can return only
than one column value ( output port ) one column value i.e. output port
Connected lookup caches all lookup
Unconnected lookup caches only the
lookup output ports in the lookup
columns
conditions and the return port
Supports user-defined default values
Does not support user defined default
(i.e. value to return when lookup
values
conditions are not satisfied)
============================================================================
What is meant by active and passive transformation?
An active transformation is the one that performs any of the following actions:
1) Change the number of rows between transformation input and output. Example: Filter
transformation.
2) Change the transaction boundary by defining commit or rollback points., example
transaction control transformation.
3) Change the row type, example Update strategy is active because it flags the rows for insert,
delete, update or reject.
On the other hand a passive transformation is the one which does not change the number
of rows that pass through it. Example: Expression transformation.
=============================================================================
Job Oriented – Instructor Led – Face2Face – True Live Online I.T. Training for Everyone Worldwide
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What is the difference between Router and Filter?
Following differences can be noted,
Router Filter
Router transformation divides the
incoming records into multiple
Filter transformation restricts or
groups based on some condition.
blocks the incoming record set based
Such groups can be mutually
on one given condition.
inclusive (Different groups may
contain same record)
Router transformation itself does not
Filter transformation does not have a
block any record. If a certain record
default group. If one record does not
does not match any of the routing
match filter condition, the record is
conditions, the record is routed to
blocked
default group
Router acts like CASE.. WHEN
Filter acts like WHERE condition is
statement in SQL (Or Switch().. Case
SQL.
statement in C)
===============================================================================
What can we do to improve the performance of Informatica Aggregator Transformation?
Aggregator performance improves dramatically if records are sorted before passing to the
aggregator and "sorted input" option under aggregator properties is checked. The record set
should be sorted on those columns that are used in Group By operation.
It is often a good idea to sort the record set in database level e.g. inside a source qualifier
transformation, unless there is a chance that already sorted records from source qualifier can
again become unsorted before reaching aggregator
===============================================================================
What are the different lookup cache(s)?
Informatica Lookups can be cached or un-cached (No cache). And Cached lookup can be either
static or dynamic. A static cache is one which does not modify the cache once it is built and it
remains same during the session run. On the other hand,
A dynamic cache is refreshed during the session run by inserting or updating the records in
cache based on the incoming source data. By default, Informatica cache is static cache.
A lookup cache can also be divided as persistent and non-persistent based on whether
Informatica retains the cache even after the completion of session run or deletes it
Job Oriented – Instructor Led – Face2Face – True Live Online I.T. Training for Everyone Worldwide
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===============================================================================
How can we update a record in target table without using Update strategy?
A target table can be updated without using 'Update Strategy'. For this, we need to define the key
in the target table in Informatica level and then we need to connect the key and the field we want
to update in the mapping Target. In the session level, we should set the target property as
"Update as Update" and check the "Update" check-box.
Let's assume we have a target table "Customer" with fields as "Customer ID", "Customer Name"
and "Customer Address". Suppose we want to update "Customer Address" without an Update
Strategy. Then we have to define "Customer ID" as primary key in Informatica level and we will
have to connect Customer ID and Customer Address fields in the mapping. If the session
properties are set correctly as described above, then the mapping will only update the customer
address field for all matching customer IDs.
==============================================================================
Under what condition selecting Sorted Input in aggregator may fail the session?
If the input data is not sorted correctly, the session will fail. Also if the input data is properly
sorted, the session may fail if the sort order by ports and the group by ports of the aggregator
are not in the same order.
==============================================================================
Why is Sorter an Active Transformation?
This is because we can select the "distinct" option in the sorter property. When the Sorter
transformation is configured to treat output rows as distinct, it assigns all ports as part of the
sort key. The Integration Service discards duplicate rows compared during the sort operation.
The number of Input Rows will vary as compared with the Output rows and hence it is an Active
transformation.
==============================================================================
Is lookup an active or passive transformation?
From Informatica 9x, Lookup transformation can be configured as as "Active"
transformation. However, in the older versions of Informatica, lookup is a passive
transformation
===============================================================================
What is the difference between Static and Dynamic Lookup Cache?
We can configure a Lookup transformation to cache the underlying lookup table. In case
of static or read-only lookup cache the Integration Service caches the lookup table at
the beginning of the session and does not update the lookup cache while it processes
the Lookup transformation.
In case of dynamic lookup cache the Integration Service dynamically inserts or updates
data in the lookup cache and passes the data to the target. The dynamic cache is
synchronized with the target.
===============================================================================
What is the difference between STOP and ABORT options in Workflow Monitor?
When we issue the STOP command on the executing session task, the Integration
Service stops reading data from source. It continues processing, writing and
committing the data to targets. If the Integration Service cannot finish processing and
Job Oriented – Instructor Led – Face2Face – True Live Online I.T. Training for Everyone Worldwide
Training@H2KInfosys.com
committing data, we can issue the abort command.
In contrast ABORT command has a timeout period of 60 seconds. If the Integration
Service cannot finish processing and committing data within the timeout period, it kills
the DTM process and terminates the session.
What are the new features of Informatica 9.x in developer level?
From a developer's perspective, some of the new features in Informatica 9.x are as
follows:
Now Lookup can be configured as an active transformation - it can return multiple rows
on successful match
Now you can write SQL override on un-cached lookup also. Previously you could do it
only on cached lookup
You can control the size of your session log. In a real-time environment you can control
the session log file size or time
Database deadlock resilience feature - this will ensure that your session does not
immediately fail if it encounters any database deadlock, it will now retry the operation
again. You can configure number of retry attempts.
=======================================================================
How to delete duplicate row using Informatica Duplicate rows are present in relational database
Suppose we have Duplicate records in Source System and we want to load only the unique
records in the Target System eliminating the duplicate rows. What will be the approach?
Assuming that the source system is a Relational Database, to eliminate duplicate records, we
can check the distinct option of the Source Qualifier of the source table and load the target
accordingly.

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Informatica interview questions by H2kInfosys

  • 1. Job Oriented – Instructor Led – Face2Face – True Live Online I.T. Training for Everyone Worldwide Training@H2KInfosys.com H2kInfosys H2K Infosys provides online IT training and placement services worldwide. USA- +1-(770)-777-1269, UK – (020) 3371 7615 Training@H2KINFOSYS.com / H2KInfosys@gmail.com DISCLAIMER H2K Infosys, LLC (hereinafter “H2K”) acknowledges the proprietary rights of the trademarks and products names of other companies mentioned in any of the training material including but not limited to the handouts, written material, videos, power point presentations, etc. All such training materials are provided to H2K students for learning purposes only. H2K students shall not use such materials for their private gain nor can they sell any such materials to a third party. Some of the examples provided in any such training materials may not be owned by H2K and as such H2K does not claim any proprietary rights for the same. H2K does not guarantee nor is it responsible for such products and projects. H2K acknowledges that any such information or product that has been lawfully received from third party source is free from restriction and without any breach or violation of law whatsoever.
  • 2. Job Oriented – Instructor Led – Face2Face – True Live Online I.T. Training for Everyone Worldwide Training@H2KInfosys.com Informatica Interview Questions What are the differences between Connected and Unconnected Lookup? The differences are illustrated in the below table Connected Lookup Unconnected Lookup Connected lookup participates in Unconnected lookup receives input dataflow and receives input directly values from the result of a LKP: from the pipeline expression in another transformation Connected lookup can use both Unconnected Lookup cache can NOT dynamic and static cache be dynamic Connected lookup can return more Unconnected Lookup can return only than one column value ( output port ) one column value i.e. output port Connected lookup caches all lookup Unconnected lookup caches only the lookup output ports in the lookup columns conditions and the return port Supports user-defined default values Does not support user defined default (i.e. value to return when lookup values conditions are not satisfied) ============================================================================ What is meant by active and passive transformation? An active transformation is the one that performs any of the following actions: 1) Change the number of rows between transformation input and output. Example: Filter transformation. 2) Change the transaction boundary by defining commit or rollback points., example transaction control transformation. 3) Change the row type, example Update strategy is active because it flags the rows for insert, delete, update or reject. On the other hand a passive transformation is the one which does not change the number of rows that pass through it. Example: Expression transformation. =============================================================================
  • 3. Job Oriented – Instructor Led – Face2Face – True Live Online I.T. Training for Everyone Worldwide Training@H2KInfosys.com What is the difference between Router and Filter? Following differences can be noted, Router Filter Router transformation divides the incoming records into multiple Filter transformation restricts or groups based on some condition. blocks the incoming record set based Such groups can be mutually on one given condition. inclusive (Different groups may contain same record) Router transformation itself does not Filter transformation does not have a block any record. If a certain record default group. If one record does not does not match any of the routing match filter condition, the record is conditions, the record is routed to blocked default group Router acts like CASE.. WHEN Filter acts like WHERE condition is statement in SQL (Or Switch().. Case SQL. statement in C) =============================================================================== What can we do to improve the performance of Informatica Aggregator Transformation? Aggregator performance improves dramatically if records are sorted before passing to the aggregator and "sorted input" option under aggregator properties is checked. The record set should be sorted on those columns that are used in Group By operation. It is often a good idea to sort the record set in database level e.g. inside a source qualifier transformation, unless there is a chance that already sorted records from source qualifier can again become unsorted before reaching aggregator =============================================================================== What are the different lookup cache(s)? Informatica Lookups can be cached or un-cached (No cache). And Cached lookup can be either static or dynamic. A static cache is one which does not modify the cache once it is built and it remains same during the session run. On the other hand, A dynamic cache is refreshed during the session run by inserting or updating the records in cache based on the incoming source data. By default, Informatica cache is static cache. A lookup cache can also be divided as persistent and non-persistent based on whether Informatica retains the cache even after the completion of session run or deletes it
  • 4. Job Oriented – Instructor Led – Face2Face – True Live Online I.T. Training for Everyone Worldwide Training@H2KInfosys.com =============================================================================== How can we update a record in target table without using Update strategy? A target table can be updated without using 'Update Strategy'. For this, we need to define the key in the target table in Informatica level and then we need to connect the key and the field we want to update in the mapping Target. In the session level, we should set the target property as "Update as Update" and check the "Update" check-box. Let's assume we have a target table "Customer" with fields as "Customer ID", "Customer Name" and "Customer Address". Suppose we want to update "Customer Address" without an Update Strategy. Then we have to define "Customer ID" as primary key in Informatica level and we will have to connect Customer ID and Customer Address fields in the mapping. If the session properties are set correctly as described above, then the mapping will only update the customer address field for all matching customer IDs. ============================================================================== Under what condition selecting Sorted Input in aggregator may fail the session? If the input data is not sorted correctly, the session will fail. Also if the input data is properly sorted, the session may fail if the sort order by ports and the group by ports of the aggregator are not in the same order. ============================================================================== Why is Sorter an Active Transformation? This is because we can select the "distinct" option in the sorter property. When the Sorter transformation is configured to treat output rows as distinct, it assigns all ports as part of the sort key. The Integration Service discards duplicate rows compared during the sort operation. The number of Input Rows will vary as compared with the Output rows and hence it is an Active transformation. ============================================================================== Is lookup an active or passive transformation? From Informatica 9x, Lookup transformation can be configured as as "Active" transformation. However, in the older versions of Informatica, lookup is a passive transformation =============================================================================== What is the difference between Static and Dynamic Lookup Cache? We can configure a Lookup transformation to cache the underlying lookup table. In case of static or read-only lookup cache the Integration Service caches the lookup table at the beginning of the session and does not update the lookup cache while it processes the Lookup transformation. In case of dynamic lookup cache the Integration Service dynamically inserts or updates data in the lookup cache and passes the data to the target. The dynamic cache is synchronized with the target. =============================================================================== What is the difference between STOP and ABORT options in Workflow Monitor? When we issue the STOP command on the executing session task, the Integration Service stops reading data from source. It continues processing, writing and committing the data to targets. If the Integration Service cannot finish processing and
  • 5. Job Oriented – Instructor Led – Face2Face – True Live Online I.T. Training for Everyone Worldwide Training@H2KInfosys.com committing data, we can issue the abort command. In contrast ABORT command has a timeout period of 60 seconds. If the Integration Service cannot finish processing and committing data within the timeout period, it kills the DTM process and terminates the session. What are the new features of Informatica 9.x in developer level? From a developer's perspective, some of the new features in Informatica 9.x are as follows: Now Lookup can be configured as an active transformation - it can return multiple rows on successful match Now you can write SQL override on un-cached lookup also. Previously you could do it only on cached lookup You can control the size of your session log. In a real-time environment you can control the session log file size or time Database deadlock resilience feature - this will ensure that your session does not immediately fail if it encounters any database deadlock, it will now retry the operation again. You can configure number of retry attempts. ======================================================================= How to delete duplicate row using Informatica Duplicate rows are present in relational database Suppose we have Duplicate records in Source System and we want to load only the unique records in the Target System eliminating the duplicate rows. What will be the approach? Assuming that the source system is a Relational Database, to eliminate duplicate records, we can check the distinct option of the Source Qualifier of the source table and load the target accordingly.