What is a staging area? Lookups are cached by default in Informatica. These Informatica questions and answers are suitable for both freshers and experienced professionals at any level. So let’s delve deeper into this. Rank transformation lets us group information. First steps in solving a data quality problem is to perform data profiling, that is to verify the level of accuracy of the source data. Menu. Informatica metadata repository stores and maintains information about all the objects in Informatica. Welcome to the finest collection of Informatica Interview Questions with standard answers that you can count on. Interview Questions; Tutorials. Use non-aggregate expressions in group by ports to modify or replace groups. The Joiner transformation uses a condition that matches one or more pairs of columns between the two sources. We cannot use a Sequence Generator or Update Strategy transformation upstream from a Union transformation. Use the Joiner transformation when we need to join the following types of sources: Sybase supports a maximum of 16 columns in an ORDER BY clause. You can configure number of retry attempts. While joining Source Data of heterogeneous sources as well as to join flat files we will use the Joiner transformation. 2. Define data analytics in the context of data warehousing. Some questions come up time and time again — usually about you, your experience and the job itself. In the Mapping Designer, We need to configure the Target Load Plan based on the Source Qualifier transformations in a mapping to specify the required loading order. Hence it is an Active transformation. What Can We Do To Improve The Performance Of Informatica Aggregator Transformation? The Designer validates datatypes in a join condition. To join rows with null values, replace null input with default values in the Ports tab of the joiner, and then join on the default values. Learn DWBI Technologies. If we skip ITEM_NAME and join on ITEM_NO and PRICE, we will, Mapplet [if it contains any one of the above mentioned transformations]. More Questions. Let us know more about the components and services associated with Powercenter. It is often a good idea to sort the record set in database level (click here to see why?) Since the instance of a reusable transformation is a pointer to that transformation, when we change the transformation in the Transformation Developer, its instances reflect these changes. Normalizer, Cobol sources, XML sources, XML Source Qualifier transformations, Target definitions, Pre- and post- session Stored Procedures, Other Mapplets. Terms of Use | From Informatica 9x, Lookup transformation can be configured as as "Active" transformation. 1. The order of the ports in the join condition can impact the performance of the Joiner transformation. 3. On certain cases, you may get huge performance gain using this technique! This article is a guide on how to Unload data from EXCEL workbook to target relational database using Informatica. What is a staging area? Now the filter condition for the three router groups will be: After we create a mapping to load data in target database from flat files, next we move on to the session property of the Source Qualifier. HBase. More on Informatica. [Taken into consideration Start Value 0, Current value 1 and Increment by 1. This section will list out all the DB questions that might hit you while facing an Informatica Interview. The Union transformation does not remove duplicate rows. Like the Aggregator transformation, the Rank transformation lets us group information. CouchDB. Find out How to configure lookup as active transformation, However, in the older versions of Informatica, lookup used to be a passive transformation. Learn DWBI Technologies. Popular Posts. Rank transformation can return the strings at the top or the bottom of a session sort order. A data warehouse blog contains examples,interview questions and tutorials on Sql,Oracle Plsql,Unix Commands,Linux Commands,Informatica and Netezza. We've gathered together the most common questions so you can get your preparation off to a flying start. It was very smooth and lenient, They took 3 rounds Technical HR and Managerial round.All rounds take more than half an hour but the panel is very cooperative and very mush skilled and experienced, they give the time to answer the questions. Joiner transformation allows you to join two heterogeneous sources in the Informatica mapping. 2. Performance tuning in Informatica powercenter? Hence if we have one Source Qualifier transformation that provides data for multiple target tables having primary and foreign key relationships, we will go for Constraint based load ordering. value to return when lookup conditions are not satisfied), Does not support user defined default values, Router transformation divides the incoming records into multiple groups based on some condition. Informatica - 1168 Informatica interview questions and 3208 answers by expert members with experience in Informatica subject. e.g. What is the purpose of a staging area? Interview Questions; Tutorials. The second targets receives a block of sequence numbers from the Sequence Generator transformation only after the first target table receives the block of sequence numbers. WHEN statement in SQL (Or Switch().. Case statement in C). Interview Loc - Bangalore. Informatica Interview Questions by Unknown | in Q&A at 9:18 PM 1. Sitemap, How to configure lookup as active transformation, Implementing Informatica Incremental Aggregation, Connected lookup participates in dataflow and receives input directly from the pipeline, Unconnected lookup receives input values from the result of a LKP: expression in another transformation, Connected lookup can use both dynamic and static cache, Unconnected Lookup cache can NOT be dynamic, Connected lookup can return more than one column value ( output port ), Unconnected Lookup can return only one column value i.e. This article gives a crucial insight to application developer in order to take informed decision regarding performance tuning. If the input data is not sorted correctly, the session will fail. That is through Dynamic lookup cache. Since Informatica process data on row by row basis, it is generally possible to handle data aggregation operation even without an Aggregator Transformation. Tasks performed by qualifier transformation: - 1. This is the first of the number of articles on the series of Data Warehouse Application performance tuning scheduled to come every week. The dynamic cache is synchronized with the target. One way to increase session performance is to increase the index and data cache sizes in the transformation properties. The Integration Service orders the target load on a row-by-row basis. As an ACTIVE transformation, the Filter transformation may change the number of rows passed through it. So if the source is Sybase, do not sort more than 16 columns. In this yet another "DWBI Concepts' Original article", we test the performance of Informatica PowerCentre 8.5 Joiner transformation versus Oracle 10g database join. What is Fact Table? TRUE and FALSE are the implicit return values from any filter condition we set. How can we filter rows in Informatica? If we do not group values, the Integration Service will return only the last row for the input rows. It can also be used to call functions to return calculated values. In the session level, we should set the target property as "Update as Update" and check the "Update" check-box. What will be the approach? An Aggregator Transformation performs calculations on groups. You also find all interview questions at link at the end of this post. Informatica Server reads when it executes a session. Informatica Interview Questions (lead level) Informatica Product Suite. Explain Informatica Architecture ? Rank port is an input/output port use to specify the column for which we want to rank the source values. Whenever we add Custom SQL or SQL override query it overrides the User-Defined Join, Source Filter, Number of Sorted Ports, and Select Distinct settings in the Source Qualifier transformation. Read and understand all the questions and their answers below and in the following pages to get a good grasp in Informatica. 2. Best Informatica Interview Questions & Answers Welcome to the finest collection of Informatica Interview Questions with standard answers that you can count on. We can designate only one Rank port in a Rank transformation. Data analytics is the science of examining … Integration Service creates the index and data caches files in memory to process the Aggregator transformation. DWBI Guru Is DWBI changing from traditional ETL & Reporting framework? A Filter transformation is an Active and Connected transformation that can filter rows in a mapping. If we have multiple Source Qualifier transformations connected to multiple targets, we can designate the order in which the Integration Service loads data into the targets. For each unique value in the group port, the transformation creates a group of rows falling within the rank definition (top or bottom, and a particular number in each rank). Answer : … What Can We Do To Improve The Performance Of Informatica Aggregator Transformation? If we select Cycle, the Integration Service cycles back to this value when it reaches the end value. Know How. If the Integration Service cannot finish processing and committing data within the timeout period, it kills the DTM process and terminates the session. Use non-aggregate expressions in group by ports to modify or replace groups may get huge performance gain this. Cases, you may get huge performance gain using this technique configured as as `` Active transformation. - 1168 Informatica Interview questions by Unknown | in Q & a at 9:18 PM.... Value when it reaches the end value use to specify the column for which we want to Rank the values... The questions and their answers below and in the session will fail to functions... Or more pairs of columns between the two sources the last row for input. Sources in the following pages to get a good grasp in Informatica subject to sort record... 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