The Rank Transformation in Informatica is an active, connected transformation used to select a bottom or top range of data. While string value ports can be ranked, the Informatica Rank Transformation is most commonly used to rank numeric port values. One might think MAX and MIN functions can accomplish this same task. However, the rank transformation allows groups of records to be ranked instead of a single value or record. The rank transformation is created with the following types of ports.
Input port (I) Output port (O) Variable port (V) Rank Port (R)
Rank Port
The port which is participated in a rank calculation is known as Rank port.
Variable Port
A port that allows you to develop an expression to store the data temporarily for rank calculation is known as a variable port. Variable port support to write expressions that are required for rank calculation.
Set the if properties to calculate the ranks
Top or bottom Number of ranks
Ports in a Rank Transformation :
| Ports | Number Required | Description |
| I | 1 Minimum | Port to receive data from another transformation. |
| O | 1 Minimum | Port we want to pass to other transformations. |
| V | not needed | can use to store values or calculations to use in an expression. |
| R | Only 1 | Rank port. Rank is calculated according to it. The Rank port is an input/output port. We must link the Rank port to another transformation. Example: Total Salary |
Configure the following properties of Rank transformation
1. Cache Directory: Directory where the integration service creates the index and data cache files.
2. Top/Bottom: Specify whether you want to select the top or bottom rank of data.
3. Number of Ranks: specify the number of rows you want to rank.
4. Case-Sensitive String Comparison: Used to sort the strings using case sensitive or not.
5. Tracing Level: Amount of logging to be tracked in the session log file.
6. Rank Data Cache Size: The data cache size default value is 2,000,000 bytes. You can set a numeric value or Auto for the data cache size. In case of Auto, the Integration Service determines the cache size at runtime.
7. Rank Index Cache Size: The index cache size default value is 1,000,000 bytes. You can set a numeric value or Auto for the index cache size. In case of Auto, the Integration Service determines the cache size at runtime.
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We can define Group by indicator for multiple ports, but Ranking can be done on a single port only.
Go to the properties tab, select the Top/Bottom value as Top and the Number of Ranks property as per need.
Click OK.
Connect output ports of Rank Transformation to other transformation or target
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