I have attended Informatica interview last week in wipro and couple of other companies, Question below I faced in those companies.
1. What are the main issues while working with flat files as source and as targets ?
2. Explain about Informatica server process that how it works relates to mapping variables?
3. write a query to retrieve the latest records from the table sorted by version(scd)
4. How do you handle two sessions in Informatica
5. which one is better performance wise joiner or look up
6. How to partition the Session?
7. How many types of sessions are there in informatica.please explain them.
8. Explain the pipeline partition with real time example?
9. Explain about cumulative Sum or moving sum?
10. CONVERT MULTIPLE ROWS TO SINGLE ROW (MULTIPLE COLUMNS) IN INFORMATICA
11. DEPLOYMENT GROUPS IN INFORMATICA
12. LOAD LAST N RECORDS OF FILE INTO TARGET TABLE - INFORMATICA
13. LOAD ALTERNATIVE RECORDS / ROWS INTO MULTIPLE TARGETS - INFORMATICA
14. SCHEDULING OPTIONS OF INFORMATICA ETL TOOL WORKFLOWS / JOBS
15. HOW TO CREATE USER DEFINED FUNCTION (UDF) IN INFORMATICA
16. PUSHDOWN OPTIMIZATION $PUSHDOWNCONFIG PARAMETER - INFORMATICA
17. PUSHDOWN OPTIMIZATION AND TYPES IN INFORMATICA
18. HOW TO LOAD ROWS INTO FACT TABLE IN DATA WAREHOUSE
19. PMCMD COMMAND USAGE IN INFORMATICA
20. DIFFERENCE BETWEEN STOP AND ABORT IN INFORMATICA
21. GENERATE DATE / TIME DIMENSION IN INFORMATICA
22. INFORMATICA ARCHITECTURE TUTORIAL - VERSION 8 / 9
23. TUNING LOOKUP TRANSFORMATION - INFORMATICA
24. LOOKUP TRANSFORMATION IS ACTIVE - INFORMATICA
25. CREATING LOOKUP TRANSFORMATION - INFORMATICA
26. CONNECTED AND UNCONNECTED LOOKUP TRANSFORMATION - INFORAMTICA
27. LOOKUP TRANSFORMATION SOURCE TYPES IN INFORMATICA
28. LOOKUP TRANSFORMATION IN INFORMATICA
29. TARGET UPDATE OVERRIDE - INFORMATICA
30. UPDATE STRATEGY TRANSFORMATION IN INFORMATICA
31. SQL QUERY OVERWRITE IN SOURCE QUALIFIER - INFORMATICA
32. How to generate sequence numbers without using the sequence generator transformation?
33. REUSABLE VS NON REUSABLE & PROPERTIES OF SEQUENCE GENERATOR TRANSFORMATION
34. How to load the data from a flat file into the target where the source flat file name changes daily?
35. DIRECT AND INDIRECT FLAT FILE LOADING (SOURCE FILE TYPE) - INFORMATICA
36. I have a flat file, want to reverse the contents of the flat file
37. Which means the first record should come as last record and last record should come as first record and load into the target file?
38. MAPPING VARIABLE USAGE EXAMPLE IN INFORMATICA
39. TRANSACTION CONTROL TRANSFORMATION IN INFORMATICA
40. How to load the name of the current processing flat file along with the data into the target using informatica mapping?
41. JOINER TRANSFORMATION IN INFORMATICA
42. How to create or implement slowly changing dimension (SCD) Type 2 Effective Date mapping in informatica/Flagging mapping in informatica/visioning mapping in informatica?
43. RANK TRANSFORMATION IN INFORMATICA
44. How to create different types of slowly changing dimensions (SCD) in informatica using the mapping wizard?
45. CONSTRAINT BASED LOADING IN INFORMATICA
46. SQL TRANSFORMATION IN SCRIPT MODE EXAMPLES - INFORMATICA
47. How to generate or load values in to the target table based on a column value using informatica etl tool.
48. DYNAMIC TARGET FLAT FILE NAME GENERATION IN INFORMATICA
49. INCREMENTAL AGGREGATION IN INFORMATICA
50. WHAT IS INFORMATICA POWERCENTER
51. What is the need of an ETL tool
52. INFORMATICA PERFORMANCE IMPROVEMENT TIPS
53. What is polling?
54. In which circumstances, informatica server creates Reject files?
55. What are the data movement modes in informatica?
56. Define mapping and session?
57. Can u generate reports in Informatica?
58. What is metadata reporter?
59. What is the default source option for update strategy transformation?
60. What is Data driven?
61. What are the tasks that source qualifier perform?
62. What is the default join that source qualifier provides?
63. What are the basic requirements to join two sources in a source qualifier transformation using default join?
64. What are the differences between joiner transformation and source qualifier transformation?
65. What are the limitations of joiner transformation?
66. What are the settings that you use to configure the joiner transformation?
67. What are the join types in joiner transformation?
68. What are the joiner caches?
69. What is the look up transformation?
70. Why use the lookup transformation?
71. What are the types of lookup transformation?
72. What is meant by lookup caches?
73. What are the types of lookup caches?
74. Which transformation should we use to normalise the COBOL and relational sources?
75. In which transformation you cannot drag ports into it?
76. How the informatica server sorts the string values in Rank transformation?
77. What are the rank caches?
78. What is the Rank index port in Rank transformation?
79. What is the Router transformation?
80. What are the types of groups in Router transformation?
81. What are the types of data that passes between informatica server and stored procedure
82. What is the status code in stored procedure transformation?
83. What is the target load order?
84. While importing the relational source definition from the database, what are the metadata of source that will be imported?
85. How many ways a relational source definition can be updated and what are they?
86. To import the flat file definition into the designer where should the flat file be placed?
87. To provide support for Mainframes source data, which files are used as a source definitions?
88. Which transformation is needed while using the Cobol sources as source definitions?
89. How to create or import flat file definition in to the warehouse designer?
90. What is a mapplet?
91. What is a transformation?
92. What are the designer tools for creating transformations?
93. What are active and passive transformations?
94. What are connected or unconnected transformations?
95. How many ways are there to create ports?
96. What are the reusable transformations?
97. What are the methods for creating reusable transformations?
98. What are the unsupported repository objects for a mapplet?
99. What are the mapping parameters and mapping variables?
100. Can we use the mapping parameters or variables created in one mapping into another mapping?
101. Can we use the mapping parameters or variables created in one mapping into any other reusable transformation?
102. How can we improve session performance in aggregator transformation?
103. What is aggregate cache in aggregator transformation?
104. What is an active transformation?
105. What is a passive transformation?
106. What is a connected transformation?
107. What is an unconnected transformation?
108. What are multi-group transformations?
109. List out all the transformations which use cache?
110. What is blocking transformation?
111. How do you promote a non-reusable transformation to reusable transformation?
112. How to create a non-reusable instance of reusable transformations?
113. Which transformation can be created only as reusable transformation but not as non-reusable transformation?
114. As union transformation gives UNION ALL output, how you will get the UNION output?
115. What are the guidelines to be followed while using union transformation?
116. Why union transformation is an active transformation?
117. What is a transaction control transformation?
118. What is the commit type if you have a transaction control transformation in the mapping?
119. What are the different transaction levels available in transaction control transformation?
120. What is a sorter transformation?
121. Why sorter is an active transformation?
122. How to improve the performance of a session using sorter transformation?
123. How to generate sequence numbers using expression transformation?
124. Design a mapping to load the cumulative sum of salaries of employees into target table?
125. Design a mapping to get the pervious row salary for the current row. If there is no pervious row exists for the current row, then the pervious row salary should be displayed as null.
126. Design a mapping to load a target table with the following values from the above source?
127. What is Data Caches size?
128. What is Index Caches size?
129. Difference between Data and Index Caches?
130. Difference between Dynamic and Static Lookup Cache?
Contributor
P Ganesh
Can you please post answer as well
ReplyDeleteClick on the questions you will find answers, some of the answers I posted in comment itself.
DeleteThanks
Kashif M
I am eagerly waiting your above questions answers because I feel these questions are very very important .
ReplyDeleteNiranjan - Answers has been posted for informatica interview questions below
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ReplyDeleteOk, I will post the answer soon. I started preparing it.
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Kashif M
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ReplyDelete125. Design a mapping to get the pervious row salary for the current row. If there is no pervious row exists for the current row, then the pervious row salary should be displayed as null.
ReplyDeleteSQ->Expression->target
Expression -> V_count=V_count+1 (variable port)
V_salary=IIF (V_count=1, NULL,V_prev_salary) (variable port)
V_prev_salary=salary (variable port)
O_prev_salary=V_salary (output port)
hi,
DeleteI have tried the above expression(s) and getting only row numbers not the previous row salary.
124. Design a mapping to load the cumulative sum of salaries of employees into target table?
ReplyDeleteSQ-> Expression->target
Expression transformation-> create a variable port V_cum_sal= V_cum_sal+salary
Create an output port O_cum_sal = V_cum_sal
118. What is the commit type if you have a transaction control transformation in the mapping?
ReplyDeleteTC_COMMIT_BEFORE
TC_COMMIT_AFTER
119. What are the different transaction levels available in transaction control transformation?
TC_CONTINUE_TRANSACTION
TC_COMMIT_BEFORE
TC_COMMIT_AFTER
TC_ROLLBACK_BEFORE
TC_ROLLBACK_AFTER
120. What is a sorter transformation?
Sorter transformation is an active and connected transformation which is used to sort the data in ascending or descending order.
121. Why sorter is an active transformation?
Since it has distinct option in its properties which filters duplicate records.
122. How to improve the performance of a session using sorter transformation?
Sorter transformation can be placed before the transformations which have sorted input port in it, to improve the session performs.
123. How to generate sequence numbers using expression transformation?
We can do with the expression transformation, create a variable port and increment it by 1. Then assign the variable port to an output port. In the expression transformation, the ports are:
V_count=V_count+1
O_count=V_count
113. Which transformation can be created only as reusable transformation but not as non- reusable transformation?
ReplyDeleteExternal Stored Procedure
114. As union transformation gives UNION ALL output, how you will get the UNION output?
1. Pass the data from union transformation to sorter.
2. Enable distinct option in sorter transformation which eliminates the duplicate data.
3. Then connect it to the target transformation.
. What are the mapping parameters and mapping variables?
ReplyDeleteMapping parameter is static value that can be defined in the session level.It maintains the same value throughout the session.
Mapping variable is dynamic throughout the session. The Informatica server saves the value of mapping variable to the repository at the end of session run and uses that value next time you run the session.
100. Can we use the mapping parameters or variables created in one mapping into another mapping?
NO, Mapping parameters or variables that is created in one mapping or mapplet cannot be used in other mapping but can be used in different transformations of the same mapping or mapplet.
101. Can we use the mapping parameters or variables created in one mapping into any other reusable transformation?
Yes. Because reusable transformation is not defined for a particular mapping or mapplet.
102. How can we improve session performance in aggregator transformation?
By using sorted input port in aggregator transformation improves the session performance. It means that the data that pass to the aggregator should be sorted before by using sorter transformation.
103. What is aggregate cache in aggregator transformation?
The aggregator transformation use data caches and index caches which stores data until it completes aggregate calculations.
104. What is an active transformation?
Active transformation is which change the no.of rows that pass through it.
(ie. No. of i/p rows =, <,> no. of o/p rows)
105. What is a passive transformation?
Passive transformation is which cannot change the no.of rows that pass through it.
(ie. No.of i/p rows = no. of o/p rows)
106. What is a connected transformation?
Connected transformation is connected through pipeline to other transformations.
107. What is an unconnected transformation?
Unconnected transformations is not connected to other transformations can be called through other transformation by some key code.
108. What are multi-group transformations?
The transformations have multiple groups that is, one group of input ports and one group of output ports are multi-group transformations. You do not have to specify the group with which to associate a rule.
Eg: Router transformation, Union transformation
109. List out all the transformations which use cache?
Lookup, Aggregator, Rank, joiner
110. What is blocking transformation?
When the integration service processes an unsorted joiner transformation, it reads all master rows before it reads the detail rows. To ensure it reads all master rows before the detail rows, the integration service blocks all the details source while it caches rows from the master source. As it blocks the detail source, the unsorted joiner is called a blocking transformation.
111. How do you promote a non-reusable transformation to reusable transformation?
By enabling make reusable option by editing the transformations.
112. How to create a non-reusable instance of reusable transformations?
We can drag the transformation from the transformation developer rather from creating new one. Since the reusable transformations are saved only in the transformation developer.
113. Which transformation can be created only as reusable transformation but not as non- reusable transformation?
External Stored Procedure
114. As union transformation gives UNION ALL output, how you will get the UNION output?
1. Pass the data from union transformation to sorter.
2. Enable distinct option in sorter transformation which eliminates the duplicate data.
3. Then connect it to the target transformation
69. Why use the lookup transformation?
ReplyDeleteLookup transformation mainly used
• To get related values
• To update SCD’s
• To perform calculations.
71. What are the types of lookup transformation?
Connected lookup and unconnected lookup
72. What is meant by lookup caches?
The Informatica server builds a cache in memory when it processes the first row of a data in a cached look up transformation. It allocates memory for the cache based on the amount you configure in the transformation or session properties. The Informatica server stores condition values in the index cache and output values in the data cache.
The result of the Lookup query and processing is the same, whether or not you cache the lookup source. However, using a lookup cache can increase session performance. You can optimize performance by caching the lookup source when the source is large.
If the lookup does not change between sessions, you can configure the transformation to use a persistent lookup cache. When you run the session, the Integration Service rebuilds the persistent cache if any cache file is missing or invalid.
The Integration Service creates the following caches for the Lookup transformation:
Data cache. For a connected Lookup transformation, stores data for the connected output ports, not including ports used in the lookup condition. For an unconnected Lookup transformation, stores data from the return port.
Index cache. Stores data for the columns used in the lookup condition.
73. What are the types of lookup caches?
1. Static cache
2. Dynamic cache
3. Persistence cache
4. Recache
5. Shared cache
74. Which transformation should we use to normalize the COBOL and relational sources?
Normalizer Transformation.
75. In which transformation you cannot drag ports into it?
Sequence Generator
76. How the Informatica server sorts the string values in Rank transformation?
When the Informatica server runs in the ASCII data movement mode it sorts session data using Binary sort order. If you configure the session to use a binary sort order, the Informatica server calculates the binary value of each string and returns the specified number of rows with the highest binary values for the string.
77. What are the rank caches?
Rank index cache
Rank data cache
78. What is the Rank index port in Rank transformation?
Rank index port in rank transformation will give the ranking position for each record in a group. For example, if you create a Rank transformation that ranks the top 5 salespersons for each quarter, the rank index numbers the salespeople from 1 to 5.
79. What is the Router transformation?
• Router transformation is the active and connected transformation which is used for multiple filter conditions.
• Router transformation is faster than multiple filter transformation since it fetches data once whereas filter transformation fetch each time for the conditions.
• Router transformation has the default group in it where it holds the data which does not meet the conditions and we can pass that data to different target.
80. What are the types of groups in Router transformation?
User defined groups and default group.
81. What are the types of data that passes between Informatica server and stored procedure?
• Input/output parameters
• Return Values
• Status code.
ReplyDelete82. What is the status code in stored procedure transformation?
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 cannot be seen by the user. It only used by the Informatica server to determine whether to continue running the session or stop.
83. What is the target load order?
The target load order is the process where Informatica server loads the data into the target while using multiple sources into multiple targets.
84. While importing the relational source definition from the database, what are the metadata of source that will be imported?
• Source name
• Database location
• Column names
• Data types
• Key constraints
85. How many ways a relational source definition can be updated and what are they?
We can update the source definition by
1. Editing the source.
2. Reimporting the source.
86. To import the flat file definition into the designer where should the flat file be placed?
By default the file will be placed in ‘Informatica\server\infashared\srcfiles\’
87. To provide support for Mainframes source data, which files are used as a source definitions?
COBOL files
88. Which transformation is needed while using the COBOL sources as source definitions?
Normalizer Transformation
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