Table of Contents:
- What is a job model?
- What are the elements of job design?
- What are the responsibilities of a job?
- What is role playing dimension in data warehouse with example?
- What are the different types of dimensions?
- What are junk dimensions?
- What are the different types of facts?
- What are the two types of dimensions?
- What is a factless fact?
- What are the 3 types of SCD?
- What is type1 table?
- What is difference between star and snowflake schema?
- What is SCD Type 3 in Informatica?
- What is SCD Type 4?
- What is type 1 and type 2 dimension?
- How do you implement SCD Type 2 in Informatica Cloud?
- What is SCD Type 2 in Informatica in interview?
- How do you implement SCD Type 2 in Informatica without lookup?
- What is SCD in Informatica?
- How would you implement SCD Type 2 in SQL query?
- What is Type 2 table?
- What is SCD1 and SCD2?
- What is SCD1 SCD2 SCD3 in Informatica?
What is a job model?
Job Models define jobs in action terms to match enterprise-wide process changes (such as SAP, Oracle, Peoplesoft, etc.) Job Models clarify work processes, and specify skills needed for training and other performance improvement strategies.
What are the elements of job design?
The five core characteristics of job design are skill variety, task identity, task significance, autonomy, and job feedback.
- Skill Variety. This refers to the range of abilities needed to perform a job. ...
- Task Identity. ...
- Task Significance. ...
- Autonomy. ...
- Job Feedback.
What are the responsibilities of a job?
WHAT ARE JOB RESPONSIBILITIES? Job responsibilities are what an organization uses to define the work that needs to be performed in a role and the functions that an employee is accountable for.
What is role playing dimension in data warehouse with example?
A table with multiple valid relationships between itself and another table is known as a role-playing dimension. This is most commonly seen in dimensions such as Time and Customer. For example, the Sales fact has multiple relationships to the Time query subject on the keys Order Day, Ship Day, and Close Day.
What are the different types of dimensions?
Types of Dimensions
- Slowly Changing Dimensions.
- Rapidly Changing Dimensions.
- Junk Dimensions.
- Stacked dimensions.
- Inferred Dimensions.
- Conformed Dimensions.
- Degenerate Dimensions.
- Role-Playing Dimensions.
What are junk dimensions?
A Junk Dimension is a dimension table consisting of attributes that do not belong in the fact table or in any of the existing dimension tables. The nature of these attributes is usually text or various flags, e.g. non-generic comments or just simple yes/no or true/false indicators.
What are the different types of facts?
There are three types of facts: Summative facts: Summative facts are used with aggregation functions such as sum (), average (), etc. Semi summative facts: There are small numbers of quasi-summative fact aggregation functions that will apply.
What are the two types of dimensions?
The basic types of dimensioning are linear, radial, angular, ordinate, and arc length. Use the DIM command to create dimensions automatically according to the object type that you want to dimension.
What is a factless fact?
A factless fact table is a fact table that does not have any measures. It is essentially an intersection of dimensions (it contains nothing but dimensional keys). ... For example, you can have a factless fact table to capture student attendance, creating a row each time a student attends a class.
What are the 3 types of SCD?
What are the types of SCD?
- Type 0 – Fixed Dimension. No changes allowed, dimension never changes.
- Type 1 – No History. Update record directly, there is no record of historical values, only current state.
- Type 2 – Row Versioning. ...
- Type 3 – Previous Value column. ...
- Type 4 – History Table. ...
- Type 6 – Hybrid SCD.
What is type1 table?
Type 1: overwrite This method overwrites old with new data, and therefore does not track historical data. Example of a supplier table: Supplier_Key. Supplier_Code.
What is difference between star and snowflake schema?
Star and snowflake schemas are similar at heart: a central fact table surrounded by dimension tables. The difference is in the dimensions themselves. In a star schema each logical dimension is denormalized into one table, while in a snowflake, at least some of the dimensions are normalized.
What is SCD Type 3 in Informatica?
The SCD Type 3 method is used to store partial historical data in the Dimension table. The dimension table contains the current and previous data. The process involved in the implementation of SCD Type 3 in informatica is. Identifying the new record and insert it in to the dimension table.
What is SCD Type 4?
SCD type 4 provides a solution to handle the rapid changes in the dimension tables. The concept lies in creating a junk dimension or a small dimension table with all the possible values of the rapid growing attributes of the dimension. ... The dimension key of the new table should be maintained in the fact table.
What is type 1 and type 2 dimension?
In a Type 1 SCD the new data overwrites the existing data. ... A Type 2 SCD retains the full history of values. When the value of a chosen attribute changes, the current record is closed. A new record is created with the changed data values and this new record becomes the current record.
How do you implement SCD Type 2 in Informatica Cloud?
SCD Type 2 Effective Date implementation - Part 1 Open the mapping designer tool, source analyzer and either create or import the source definition. Go to the Warehouse designer or Target designer and import the target definition. Go to the mapping designer tab and create new mapping. Drag the source into the mapping.
What is SCD Type 2 in Informatica in interview?
Here in this article, we will be building an Informatica PowerCenter mapping to load SCD Type 2 Dimension....
- Join Staging Table and Dimension Table. ...
- Data Transformation. ...
- Identify Insert/Update. ...
- Insert The new Records. ...
- Update(Expire) the Old Version.
How do you implement SCD Type 2 in Informatica without lookup?
We can use SCD without using lookup.
- Mahendra Rajpoot. Answered On : Sep 17th, 2014.
- Yes it is possible. Use left outer join query between source and target table in SQ to achieve look up functionality. Send this output to EXPR and then RTR for condition check SCD 2. Then insert and update Target based on RTR conditions.
What is SCD in Informatica?
Our article explores what Slowly Changing Dimensions (SCD) are and how to implement them in Informatica PowerCenter. As the name suggests, SCD allows maintaining changes in the Dimension table in the data warehouse. These are dimensions that gradually change with time, rather than changing on a regular basis.
How would you implement SCD Type 2 in SQL query?
Impala or Hive Slowly Changing Dimension – SCD Type 2 Implementation. Netezza MERGE command to Manipulate Records from Table....
- Step 1: Load expired records from TGT to INT table. ...
- Step 2: Get all records which are going to expire. ...
- Step 3: Copy active records from TGT to INT table.
What is Type 2 table?
Type 2 – This is the most commonly used type of slowly changing dimension. For this type of slowly changing dimension, add a new record encompassing the change and mark the old record as inactive. ... This allows the fact table to still use the data stored under the old dimension key for historical reporting.
What is SCD1 and SCD2?
SCD1: only maintained updated values. Ex: a customer address modified we update existing record with new address. SCD2: maintaining historical information and current information by using. A) Effective Date.
What is SCD1 SCD2 SCD3 in Informatica?
SCD1: in SCD1, no history is maintained. SCD2: whole history is maintained. SCD3: just the current and last record is stored.
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