“Informatica Data Warehousing Frequently Asked Questions in various Informatica Data Warehousing Interviews asked by the interviewer. So learn Informatica Data Warehousing with the help of this Informatica Data Warehousing Interview questions and answers guide and feel free to comment as your suggestions, questions and answers on any Informatica Data Warehousing Interview Question or answer by the comment feature available on the page.”
When you add a relational or a flat file source definition to a maping,U need to connect it to a source qualifer transformation.The source qualifier transformation represnets the records that the informatica server reads when it runs a session.
SQ transformation is a transformation which is automatically generated to read data from source tables into informatica designer.
We have mainly tree ports Inport, Outport, Variable port. Inport represents data is flowing into transformation. Outport is used when data is mapped to next transformation. Variable port is used when we mathematical calculations are required. If any addition i will be more than happy if you can share.
We can use variable ports to store values of previous records which is not otherwise possible in Informatica.
As far my knowledge by using power exchange tool convert vsam file to oracle tables then do mapping as usual to the target table.
Factless Facts:Facts without any measures.
Additive Facts:Fact data that can be additive/aggregative.
Non-Additive facts: Facts that are result of non-additon
Semi-Additive Facts: Only few colums data can be added.
Periodic Facts: That stores only one row per transaction that happend over a period of time.
Accumulating Fact: stores row for entire lifetime of event.
There are three types of facts
1)Additive fact:a fact which can be summarized by any one of dimension or all dimensions EX:QTY,REVENUE
2)Semi additive fact:a fact which can be summarized for few dimensions not for all dimensions. ex:current balance
3)non additive fact: a fact which cannot be summarized by any of dimensions.ex:percentage of profit
Repository is a database in which all informatica componets are stored in the form of tables. The reposiitory server controls the repository and maintains the data integrity and Consistency across the repository when multiple users use Informatica. Powercenter Server/Infa Server is responsible for execution of the components (sessions) stored in the repository.
Normal Load: Normal load will write information to the database log file so that if any recorvery is needed it is will be helpful. when the source file is a text file and loading data to a table,in such cases we should you normal load only, else the session will be failed.
Bulk Mode: Bulk load will not write information to the database log file so that if any recorvery is needed we can't do any thing in such cases.
compartivly Bulk load is pretty faster than normal load.
I am providing the answer which I have taken it from Informatica 7.1.1 manual,
Ans: While running a Workflow,the PowerCenter Server uses the Load Manager process and the Data Transformation Manager Process (DTM) to run the workflow and carry out workflow tasks.When the PowerCenter Server runs a workflow, the Load Manager performs the following tasks:
1. Locks the workflow and reads workflow properties.
2. Reads the parameter file and expands workflow variables.
3. Creates the workflow log file.
4. Runs workflow tasks.
5. Distributes sessions to worker servers.
6. Starts the DTM to run sessions.
7. Runs sessions from master servers.
8. Sends post-session email if the DTM terminates abnormally.
When the PowerCenter Server runs a session, the DTM performs the following tasks:
1. Fetches session and mapping metadata from the repository.
2. Creates and expands session variables.
3. Creates the session log file.
4. Validates session code pages if data code page validation is enabled. Checks query
conversions if data code page validation is disabled.
5. Verifies connection object permissions.
6. Runs pre-session shell commands.
7. Runs pre-session stored procedures and SQL.
8. Creates and runs mapping, reader, writer, and transformation threads to extract,transform, and load data.
9. Runs post-session stored procedures and SQL.
10. Runs post-session shell commands.
11. Sends post-session email.
Partition points mark the thread boundaries in a source pipeline and divide
the pipeline into stages.
Partition points mark the thread boundaries in a pipeline and
divide the pipeline into stages. The Informatica Server sets partition points at several
transformations in a pipeline by default. If you use PowerCenter, you can define other partition
points. When you add partition points, you increase the number of transformation threads,
which can improve session performance. The Informatica Server can redistribute rows of data at partition points, which can also improve session performance.
rendc.org
Whether it is technological solutions or user-oriented innovations, We have put together for you the best sources of HR Interview Questions and Answers, Tech Ideas, and Programming Tutorials."
Get all the latest information on rendc.org
© 2022 | All rights reserved.
RENDC
welcome to www.rendc.org
