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If u had to split the source level key going into two seperate tables. One as surrogate and other as primary. Since informatica does not gurantee keys are loaded properly(order!) into those tables. What are the different ways you could handle this type of situation?
sreedhar
- Sep 27th, 2006
u r sending data into two different tbls ... of course by setting primary key in the target tables ..the thing is the surrogate key generation requires seperate mapping which suits for scd concept..
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What is the best way to show metadata(number of rows at source, target and each transformation level, error related data) in a report format
manikandan1982
- Feb 21st, 2006
You can select these details from the repository table. you can use the view REP_SESS_LOG to get these data
rajarajana
- Feb 15th, 2006
When your workflow get completed go to workflow monitor right click the session .then go to transformation statistics ther we can see number of rows in source and target.if we go for session properties we can see errors related to data
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Two relational tables are connected to SQ Trans,what are the possible errors it will be thrown?
Shanmugam
- Jul 6th, 2006
The only two possibilities as of I know isBoth the table should have primary key/foreign key relation shipBoth the table should be available in the same schema or same database
geek_78
- Feb 18th, 2006
We can connect two relational table in one sq Transformation.No errors will be performRegards,R.Karthikeyan
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With out using Updatestretagy and sessons options, how we can do the update our target table?
prasadns26
- Jul 18th, 2006
hi,if ur database is teradata we can do it with a tpump or mload external loader.update override in target properties is used basically for updating the target table based on a non key column.e.g upda...
Raajavarman
- Mar 11th, 2006
By default all the rows in the session is set as insert flag ,you can change it in the session general properties -- Treate source rows as :update...
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Could anyone please tell me what are the steps required for type2 dimension/version data mapping. how can we implement it
babushiv
- May 24th, 2010
The Type 2 Dimension Data mapping inserts both new and changed dimensions into the target. Changes are tracked in the target table by versioning the primary key and creating a version number for each ...
Rob
- Apr 25th, 2006
1. Determine if the incoming row is 1) a new record 2) an updated record or 3) a record that already exists in the table using two lookup transformations. Split the mapping into 3 seperate flows using...
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If you are workflow is running slow in informatica. Where do you start trouble shooting and what are the steps you follow?
dashingcar
- Apr 19th, 2010
PowerCenter 8.1.1 Performance Tuning Guide Generally, look for performance bottlenecks in the following order: 1. Target 2. Source 3. Mapping 4. Session 5. System Use the following methods to identify...
rajendar
- Feb 12th, 2006
work flow may be slow due to different reasons one is alpa characters in decimal data check it out this and due to insufficient length of strings check with the sql override
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How to lookup the data on multiple tabels.
prasadns26
- Jul 18th, 2006
hi,what ever my friends have answered earlier is correct. to be more specific,if the two tables are relational, then u can use the SQL lookup over ride option to join the two tables in the lookup prop...
rajendar
- Feb 12th, 2006
join the two source by using the joiner transformation and then apply a look up on the resaulting table
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Source table has 1000 rows. In session configuration --- target Load option-- \
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Which transformation you need while using the COBOL sources as source definitions?
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sithusithu- Member Since Dec-2005 | Jan 20th, 2006
Normalizer transformation.
Normalizer transformation which is used to normalize the data.Since COBOL sources are often consists of De-normalized data.sithusithu
- Jan 20th, 2006
Normalizer transformation. Normalizer transformation which is used to normalize the data.Since COBOL sources are often consists of De-normalized data.
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Which source definition files are needed to provide support for Mainframes ?
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deepthi_97- Member Since Sep-2009 | Sep 23rd, 2009
Cobol files and we use normalizer transformation
Prabu
- Jun 22nd, 2007
The mainframe files are Used as VSAM files in Informatica by using the Normaliser transformation
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What are various types of Aggregation?
Various types of aggregation are SUM, AVG, COUNT, MAX, MIN, FIRST, LAST, MEDIAN, PERCENTILE, STDDEV, and VARIANCE.
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sithusithu
- Jan 19th, 2006
AVG COUNT FIRST LAST MAX MEDIAN MIN PERCENTILE STDDEV SUM VARIANCECheers,Sithu
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How to extract data from XML and flatfiles in informatica?
k.shankar
- Apr 7th, 2011
When importing the source definition, the file must be in a directory local to the client machine. In addition, the Integration Service must be able to access all source files during the session. ...
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What is a Source Qualifier?
It represents all data queried from the source.
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sprajarajan- Member Since Mar-2008 | Aug 8th, 2008
Source Qualifier Is the default Transformation.
Through The source Qualifier Transformation Informatica Reads The Data.
We can Filter The Data.
We can sort the Data.
Its also Used to Join Homogeneous Source systems.
We can Join Any number of Sources in Singlae Source Qualifier.
We Can't Join the Flatfiles In sourcequalifier Because Flatfiles Are Heterogeneous When we open the Flatfiles At sourcequalifier At the time All The options are Disabled.joyfun23
- Jan 26th, 2010
1. Source Qualifier is the most important transformation which convert the source data type in to compatible NATIVE datatype of a mapping.2. Without a SQ a mapping can not be created,?after extractio...
venkat224
- Dec 24th, 2009
Source Qualifier is one of the transformations, which converts any type of data to the relational format. So that, can easily be used for any of the operations on the data.
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What is Data Transformation Manager?
After the load manager performs validations for the session, it creates the DTM process. The DTM process is the second process associated with the session run. The primary purpose of the DTM process is to create and manage threads that carry out the session tasks.· The DTM allocates process memory for the session and divide it into buffers. This is also known as buffer memory. It creates the main thread,...
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Goush- Member Since May-2007 | May 15th, 2007
When the workflow reaches a session, the Integration Service process starts
the DTM process. The DTM is the process associated with the session and it
performs the following tasks:
1. Retrieves and validates session information from the repository.
2. Performs pushdown optimization when the session is configured for
pushdown optimization.
3. Adds partitions to the session when the session is configured for dynamic
partitioning.
4. Forms partition groups when the session is configured to run on a grid.
5. Expands the service process variables, session, and mapping variables and
parameters.
6. Creates the session log.
7. Validates source and target code pages.
8. Verifies connection object permissions.
9. Runs pre-session shell commands, stored procedures and SQL.
10. Sends a request to start worker DTM processes on other nodes when the
session is configured to run on a grid.
11. Creates and runs mapping, reader, writer, and transformation threads to
extract, transform, and load data.
12. Runs post-session stored procedures, SQL, and shell commands
13. Sends post-session email.
jayapraveen
- Oct 4th, 2010
load manager creates the DTM(data transformation manager)in the work flow manager by the informatica server ,here DTM creates two threads 1.reader thread2.writer threadDTM reads the data from &nb...
chandrarekha
- Sep 6th, 2007
Load manager and DTM are the components of Informatica server. Load manager manages the load on the server by maintaining a queue of sessions and release the session based on first come and firs...
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Discuss the advantages & Disadvantages of star & snowflake schema?
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Answered by: swati
- Nov 5th, 2005
star schema consists of single fact table surrounded by some dimensional table.In snowflake schema the dimension tables are connected with some subdimension table.
In starflake dimensional ables r denormalized,in snowflake dimension tables r normalized.
star schema is used for report generation ,snowflake schema is used for cube.
The advantage of snowflake schema is that the normalized tables r easier to maintain.it also saves the storage space.
The disadvantage of snowflake schema is that it reduces the effectiveness of navigation across the tables due to large no of joins between them.
halgai
- Oct 8th, 2007
Snowflakes are an addition to the Kimball Dimensional system to enable that system to handle hierarchial data. When Kimball proposed the dimensional data warehouse it was not first recogonized t...
Richard
- Feb 2nd, 2006
It depends upon the clients which they are following, whether snowflake or star schema.
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Power Center Server and Client components
What are the server and client components for Informatica Power Center?
Jaspreet_banga
- Mar 31st, 2011
Client components are:-1.repository manager administration console, 2.designer,3.mapping designer,4.mapplet designer and 5.transformation developerserver components are:-1.integration service 2.repository service3.web hub service4.sap bw service
Sithara Knk
- Mar 20th, 2011
Repository server administration consoleRepository managerDesignerWorkflow managerWorkflow monitor
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What are Target Types on the Server?
Target Types are File, Relational and ERP.
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manojkumar_dwh- Member Since Apr-2007 | Apr 14th, 2007
PowerCenter can load data into the following targets:
- Relational. Oracle, Sybase, Sybase IQ, Informix, IBM DB2, Microsoft SQL Server, and Teradata.
- File. Fixed and delimited flat file and XML.
- Application. You can purchase additional PowerCenter Connect products to load data into SAP BW. You can also load data into IBM MQSeries message queues and TIBCO.
- Other. Microsoft Access.
You can load data into targets using ODBC or native drivers, FTP, or external loaders.
Informatica Interview Questions
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