Informatica Reference: Mapping Parameters & Variables (2022)

Mapping parameters and variables represent values in mappings and mapplets.

When we use a mapping parameter or variable in a mapping, first we declare the mapping parameter or variable for use in each mapplet or mapping. Then, we define a value for the mapping parameter or variable before we run the session.

Mapping Parameters

A mapping parameter represents a constant value that we can define before running a session.

A mapping parameter retains the same value throughout the entire session.

Example: When we want to extract records of a particular month during ETL process, we will create a Mapping Parameter of data type and use it in query to compare it with the timestamp field in SQL override.

After we create a parameter, it appears in the Expression Editor.

We can then use the parameter in any expression in the mapplet or mapping.

We can also use parameters in a source qualifier filter, user-defined join, or extract override, and in the Expression Editor of reusable transformations.

Mapping Variables

Unlike mapping parameters, mapping variables are values that can change between sessions.

·The Integration Service saves the latest value of a mapping variable to the repository at the end of each successful session.

·We can override a saved value with the parameter file.

·We can also clear all saved values for the session in the Workflow Manager.

We might use a mapping variable to perform an incremental read of the source. For example, we have a source table containing time stamped transactions and we want to evaluate the transactions on a daily basis. Instead of manually entering a session override to filter source data each time we run the session, we can create a mapping variable, $$IncludeDateTime. In the source qualifier, create a filter to read only rows whose transaction date equals $$IncludeDateTime, such as:

TIMESTAMP = $$IncludeDateTime

In the mapping, use a variable function to set the variable value to increment one day each time the session runs. If we set the initial value of $$IncludeDateTime to 8/1/2004, the first time the Integration Service runs the session, it reads only rows dated 8/1/2004. During the session, the Integration Service sets $$IncludeDateTime to 8/2/2004. It saves 8/2/2004 to the repository at the end of the session. The next time it runs the session, it reads only rows from August 2, 2004.

Used in following transformations:

Expression

Filter

Router

Update Strategy

Initial and Default Value:

When we declare a mapping parameter or variable in a mapping or a mapplet, we can enter an initial value. When the Integration Service needs an initial value, and we did not declare an initial value for the parameter or variable, the Integration Service uses a default value based on the data type of the parameter or variable.

Data ->Default Value

(Video) Mapping Variables & Parameter in Informatica, Powercenter

Numeric ->0

String ->Empty String

Date time ->1/1/1

Variable Values:Start value and current value of a mapping variable

Start Value:

The start value is the value of the variable at the start of the session. The Integration Service looks for the start value in the following order:

· Value in parameter file

· Value saved in the repository

· Initial value

· Default value

Current Value:

The current value is the value of the variable as the session progresses. When a session starts, the current value of a variable is the same as the start value. The final current value for a variable is saved to the repository at the end of a successful session. When a session fails to complete, the Integration Service does not update the value of the variable in the repository.

Note:If a variable function is not used to calculate the current value of a mapping variable, the start value of the variable is saved to the repository.

Variable Data type and Aggregation Type When we declare a mapping variable in a mapping, we need to configure the Data type and aggregation type for the variable. The IS uses the aggregate type of a Mapping variable to determine the final current value of the mapping variable.

Aggregation types are:

Count:Integer and small integer data types are valid only.

Max:All transformation data types except binary data type are valid.

Min:All transformation data types except binary data type are valid.

Variable Functions

Variable functions determine how the Integration Service calculates the current value of a mapping variable in a pipeline.

SetMaxVariable:Sets the variable to the maximum value of a group of values. It ignores rows marked for update, delete, or reject. Aggregation type set to Max.

SetMinVariable:Sets the variable to the minimum value of a group of values. It ignores rows marked for update, delete, or reject. Aggregation type set to Min.

SetCountVariable:Increments the variable value by one. It adds one to the variable value when a row is marked for insertion, and subtracts one when the row is Marked for deletion. It ignores rows marked for update or reject. Aggregation type set to Count.

SetVariable:Sets the variable to the configured value. At the end of a session, it compares the final current value of the variable to the start value of the variable. Based on the aggregate type of the variable, it saves a final value to the repository.

Creating Mapping Parameters and Variables

· Open the folder where we want to create parameter or variable.

(Video) Mapping Parameters | Informatica

· In the Mapping Designer, click Mappings > Parameters and Variables. -or- In the Mapplet Designer, click Mapplet > Parameters and Variables.

· Click the add button.

· Enter name. Do not remove $$ from name.

· Select Type and Data type. Select Aggregation type for mapping variables.

· Give Initial Value. Click ok.

· Example: Use of Mapping of Mapping Parameters and Variables

· EMP will be source table.

Create a target table MP_MV_EXAMPLE having columns: EMPNO, ENAME, DEPTNO, TOTAL_SAL, MAX_VAR, MIN_VAR, COUNT_VAR and SET_VAR.

TOTAL_SAL = SAL+ COMM + $$BONUS (Bonus is mapping parameter that changes every month)

SET_VAR: We will be added one month to the HIREDATE of every employee.

Create shortcuts as necessary.

Creating Mapping

1. Open folder where we want to create the mapping.

2. Click Tools -> Mapping Designer.

3. Click Mapping-> Create-> Give name. Ex: m_mp_mv_example

4. Drag EMP and target table.

5. Transformation -> Create -> Select Expression for list -> Create –> Done.

6. Drag EMPNO, ENAME, HIREDATE, SAL, COMM and DEPTNO to Expression.

7. Create Parameter $$Bonus and Give initial value as 200.

8. Create variable $$var_max of MAX aggregation type and initial value 1500.

9. Create variable $$var_min of MIN aggregation type and initial value 1500.

10. Create variable $$var_count of COUNT aggregation type and initial value 0. COUNT is visible when datatype is INT or SMALLINT.

11. Create variable $$var_set of MAX aggregation type.


12. Create 5 output ports out_ TOTAL_SAL, out_MAX_VAR, out_MIN_VAR,

out_COUNT_VAR and out_SET_VAR.

(Video) How to use the value of a mapping variable from parameter file

13. Open expression editor for TOTAL_SAL. Do the same as we did earlier for SAL+ COMM. To add $$BONUS to it, select variable tab and select the parameter from mapping parameter. SAL + COMM + $$Bonus

14. Open Expression editor for out_max_var.

15. Select the variable function SETMAXVARIABLE from left side pane. Select

$$var_max from variable tab and SAL from ports tab as shown below.SETMAXVARIABLE($$var_max,SAL)

17. Open Expression editor for out_min_var and write the following expression:

SETMINVARIABLE($$var_min,SAL). Validate the expression.

18. Open Expression editor for out_count_var and write the following expression:

SETCOUNTVARIABLE($$var_count). Validate the expression.

19. Open Expression editor for out_set_var and write the following expression:

SETVARIABLE($$var_set,ADD_TO_DATE(HIREDATE,'MM',1)). Validate.

20. Click OK. Expression Transformation below:

21. Link all ports from expression to target and Validate Mapping and Save it.

22. See mapping picture on next page.

PARAMETER FILE

A parameter file is a list of parameters and associated values for a workflow, worklet, or session.

Parameter files provide flexibility to change these variables each time we run a workflow or session.

We can create multiple parameter files and change the file we use for a session or workflow. We can create a parameter file using a text editor such as WordPad or Notepad.

Enter the parameter file name and directory in the workflow or session properties.

A parameter file contains the following types of parameters and variables:

Workflow variable:References values and records information in a workflow.

Worklet variable:References values and records information in a worklet. Use predefined worklet variables in a parent workflow, but we cannot use workflow variables from the parent workflow in a worklet.

Session parameter:Defines a value that can change from session to session, such as a database connection or file name.

Mapping parameter and Mapping variable

(Video) 04 Parameters & variables: Tips for Informatica PowerCenter Specialist Certification!

USING A PARAMETER FILE

Parameter files contain several sections preceded by a heading. The heading identifies the Integration Service, Integration Service process, workflow, worklet, or session to which we want to assign parameters or variables.

· Make session and workflow.

· Give connection information for source and target table.

· Run workflow and see result.

Sample Parameter File for Our example:

In the parameter file, folder and session names are case sensitive.

Create a text file in notepad with name Para_File.txt

[Practice.ST:s_m_MP_MV_Example]

$$Bonus=1000

$$var_max=500

$$var_min=1200

$$var_count=0

CONFIGURING PARAMTER FILE

We can specify the parameter file name and directory in the workflow or session properties.

To enter a parameter file in the workflow properties:

1. Open a Workflow in the Workflow Manager.

2. Click Workflows > Edit.

3. Click the Properties tab.

4. Enter the parameter directory and name in the Parameter Filename field.

5. Click OK.

To enter a parameter file in the session properties:

1. Open a session in the Workflow Manager.

2. Click the Properties tab and open the General Options settings.

3. Enter the parameter directory and name in the Parameter Filename field.

4. Example: D:\Files\Para_File.txt or $PMSourceFileDir\Para_File.txt

(Video) Informatica : Mapping and Workflow Variable Value Assignments

5. Click OK.


FAQs

What is the difference between mapping parameter and variable in Informatica? ›

Unlike a mapping parameter, a mapping variable represents a value that can change through the session. The Integration Service saves the value of a mapping variable to the repository at the end of each successful session run and uses that value the next time you run the session.

What is $$ $$$ in Informatica? ›

$$$ refers System Parameters like $$$SessStartTime. Actually $ means internal Parameter/Variable (such as $DBConnection prefix or $PMSessionLogDir) whereas $$ are used for user-defined parameters or variables (which could be defined at mapping or workflow/worklet level).

What is mapping parameter and variable? ›

Mapping parameters and variables represent values in mappings and mapplets. When we use a mapping parameter or variable in a mapping, first we declare the mapping parameter or variable for use in each mapplet or mapping. Then, we define a value for the mapping parameter or variable before we run the session.

What is mapping parameter in Informatica? ›

A mapping parameter represents a constant value that you can change between mapping runs. Create parameters to rerun a mapping with different values. Use parameters to change the values of connections, file directories, expression components, port lists, port links, and task properties.

What is the difference between $VAR and $$ VAR? ›

Difference between Both: The variable $var is used to store the value of the variable and the variable $$val is used to store the reference of the variable.

What are the types of parameters in Informatica? ›

You can define the following types of parameter and variable in a parameter file:
  • Service variables. ...
  • Service process variables. ...
  • Workflow variables. ...
  • Worklet variables. ...
  • Session parameters. ...
  • Mapping parameters. ...
  • Mapping variables.

Why we use $$ in Informatica? ›

$$ is a varaiable that is declared manually. where as $ is a system defined variable. declare it in the workflow level variables.

Why do we use parameters in Informatica? ›

Informatica parameter file is a text file which contains Parameter values and Variable values for mapping, session and workflows. It keeps the properties of workflows, sessions and mappings.

Which is the best ETL tool? ›

Top 7 ETL Tools for 2022
  • Table of Contents:
  • Integrate.io.
  • Talend.
  • Apache Nifi.
  • AWS Glue.
  • Pentaho.
  • Google Data Flow.
  • Azure Data Factory.
Feb 3, 2022

How can we use mapping parameter in Informatica with example? ›

Mapping Parameters in Informatica With Example - YouTube

How do you assign a mapping variable in Informatica? ›

Name of the mapping variable you want to set. Use with mapping variables with Max/Min aggregation type. The value you want to set the current value of the variable to. You can enter any valid transformation expression that evaluates to a datatype compatible with the datatype of the variable.

How do you pass a mapping variable to workflow variable in Informatica? ›

Use Mapping Variable and set it with SetVariable function. Next, create a Workflow variable and use it on your session Components tab, in Post-session on success variable assignment to pass the value from your mapping variable, to your workflow variable.

What are the session parameters? ›

A session parameter is a variable that IBM® Cognos® Framework Manager associates with a session. For example, user ID and preferred language are both session parameters. Because session parameters are key and value pairs, you can think of each session parameter as an entry in a parameter map named Session Parameters.

How do you parameterize values in Informatica? ›

How to Configure Parameters
  1. In a reusable transformation, create a parameter for a property in the transformation or for a variable in the Expression Editor.
  2. Add the transformation to a mapping or to a mapplet.
  3. In the transformation. Parameters. tab, choose how to set the parameter value in the mapping or the mapplet.

Can we use mapping variable in session? ›

If you use mapping variables in a session, you can clear any of the variable values saved in the repository by editing the session. When you clear the variable values, the Integration Service uses the values in the parameter file the next time you run a session.

What is the difference between $message and $$ message? ›

$message is used to store variable data. $$message can be used to store variable of a variable. Data stored in $message is fixed while data stored in $$message can be changed dynamically.

What is PHP and $$ variables? ›

PHP $ and $$ Variables. The $var (single dollar) is a normal variable with the name var that stores any value like string, integer, float, etc. The $$var (double dollar) is a reference variable that stores the value of the $variable inside it.

How does PHP Isset work? ›

PHP isset() Function

The isset() function checks whether a variable is set, which means that it has to be declared and is not NULL. This function returns true if the variable exists and is not NULL, otherwise it returns false.

What is incremental load in Informatica? ›

Incremental data loading is defined as the process of loading the selective data. It is either updated or creates a new source system to the target system. This is different from a full data load where entire data is processed each load.

What is difference between ETL and Informatica? ›

Data Integration technologies allow data from different databases and formats to communicate with each other. But there are different architecture in data integration technology. Informatica uses the Extract, Transform & Load (ETL) architecture which is the most popular architecture to perform data integration.

Why Informatica is best ETL tool? ›

Informatica is one of the best data integration platforms. Data Integration can be done for a huge amount of data and from multiple sources in lesser time than any other ETL tool. Informatica's data integration tool can work over the widest range of systems and platforms.

How do you use map parameters? ›

Using parameters in a mapping
  1. In the mapping, select the Source transformation.
  2. On the. Source. ...
  3. Add a Filter transformation.
  4. On the. Filter. ...
  5. Configure the Target transformation.
  6. Select the Source transformation.
  7. On the. Source.

What is the difference between stop and abort? ›

What is the difference between STOP and ABORT options in Workflow Monitor? - The STOP option is used to execute the session task and allow other task to run, whereas ABORT option completely turns off the task that is running.

Which ETL tool is faster? ›

Apache is one of the fastest and most secure marketing ETL tools available in the market today. Built on open source technology, Apache has been modified over time to provide seamless data integration and manipulation experience for its users.

Which ETL tool is in high demand? ›

Which ETL tool is used most? There is no such ETL tool that is used most but here are some of the ETL Tools that are in high demand across industries Xplenty, Skyvia, Talend, Apache Nifi.

Which is better Informatica or SSIS? ›

Informatica is the more capable tool on paper whilst SSIS is more widely used, less expensive and there is an abundance of expertise available. However, it all comes down to which tool better aligns to a customer's requirements. Yes, Informatica is expensive, but has a lot of features and is very easy to learn.

How many mappings can be assigned to an session? ›

A session can have a single mapping at a time and once assigned, it cannot be changed. To execute a session task, it must be added to a workflow.

Can you use the mapping parameters or variables created in one mapping into another mapping? ›

Can we use the mapping parameters or variables created in one mapping into another mapping? NO. We can use the mapping parameters or variables only in the transformations of the same mapping or mapplet in which we have created the mapping parameters or variables.

Can we use mapping parameter in mapplet? ›

We can use the mapping parameters or variables in the transformations of the same mapping or mapplet.

Can we use mapping variable in workflow? ›

You can't. Mappings cannot see workflow variables and workflows cannot see mapping variables. If you need to pass a value created in one mapping to another, you can do so by storing the value in a file, a table, or by generating a parameter file that the second mapping uses.

How do you use mapping parameters in expression transformation? ›

To use User Parameter in Expression do as following :
  1. Open Informatica Cloud and click Design > Mappings.
  2. Create an Input Parameter in the Mapping eg: Userpara.
  3. Go to the Expression transformation -> Expression.
  4. Create a Field and give the Input parameter in the Expression section eg: NewString = $Userpara$​
May 19, 2022

How many input parameters can exist in an unconnected lookup? ›

How many input parameters can exist in an unconnected lookup? Any number of input parameters can exist. For instance, you can provide input parameters like column 1, column 2, column 3, and so on. But the return value would only be one.

Can we use mapping variable in rank transformation? ›

Variable functions not found in the Rank or Aggregator transformation. You cannot use variable functions in the Rank or Aggregator transformation.

How do you pass workflow variable to Worklet? ›

Configure the workflow to use a workflow variable, for example, $$PassURLString. Configure worklet wklt_CreateCustList to assign the value of worklet variable $$URLString1 to workflow variable $$PassURLString after the worklet completes.

Which of the following transformation can be used to set the value of the mapping variable using variable functions? ›

The transformation language provides the following variable functions to use in a mapping: SetMaxVariable. Sets the variable to the maximum value of a group of values. It ignores rows marked for update, delete, or reject.

What will happen if Informatica server does not find session parameter and variable? ›

If the Integration Service cannot find a value for a user-defined session parameter, it fails the session, takes an empty string as the default value, or fails to expand the parameter at run time.

What is the parameter file? ›

A parameter file is a file that contains a list of initialization parameters and a value for each parameter. You specify initialization parameters in a parameter file that reflect your particular installation. Oracle supports the following two types of parameter files: Server Parameter Files.

How do I create a workflow variable in Informatica? ›

Creating a User-Defined Variable
  1. Open the workflow in the editor.
  2. Create a user-defined workflow variable in the workflow properties or in a task properties. In the workflow. ...
  3. Enter a name and optionally a description for the variable.
  4. Select the variable datatype.
  5. Enter an initial value for the variable.
  6. Click. OK.

Where is parameter file in Informatica? ›

Default is $PMRootDir/temp. Directory for workflow logs. Default is $PMRootDir/../logs. uses the default parameter file directory.

What is meant by input parameters? ›

An Input Parameter allows you to provide data to an element for further use. The Input Parameter becomes available in that element's scope. For example, if you add an Input Parameter to a Client Action you can: Provide a value for that Input Parameter when calling the Client Action.

What is the difference between and $$ in Informatica? ›

Actually $ means internal Parameter/Variable (such as $DBConnection prefix or $PMSessionLogDir) whereas $$ are used for user-defined parameters or variables (which could be defined at mapping or workflow/worklet level).

What is the difference between variable and parameter in Informatica? ›

Unlike a mapping parameter, a mapping variable represents a value that can change through the session. The Integration Service saves the value of a mapping variable to the repository at the end of each successful session run and uses that value the next time you run the session.

Which aggregation types can be used for mapping variables? ›

You can configure a mapping variable for a Count aggregation type when it is an Integer or Small Integer. You can configure mapping variables of any datatype for Max or Min aggregation types.

What is the difference between & $$ in mapping or parameter file in which case they are generally used? ›

Actually $ means internal Parameter/Variable (such as $DBConnection prefix or $PMSessionLogDir) whereas $$ are used for user-defined parameters or variables (which could be defined at mapping or workflow/worklet level).

What is the difference between mapping and mapplet? ›

An Informatica Mapplet is a reusable object that comprises a set of transformations that can be used in multiple maps.
...
Do Mapplet and Mapping do the same?
MappletsMapping
The transformations in mapplets can be reused.The transformations in mapping cannot be reused.
4 more rows

What is the difference between stop and abort? ›

What is the difference between STOP and ABORT options in Workflow Monitor? - The STOP option is used to execute the session task and allow other task to run, whereas ABORT option completely turns off the task that is running.

How do you assign a mapping variable in Informatica? ›

Name of the mapping variable you want to set. Use with mapping variables with Max/Min aggregation type. The value you want to set the current value of the variable to. You can enter any valid transformation expression that evaluates to a datatype compatible with the datatype of the variable.

Videos

1. How Many Ways to Create Parameter File | Informatica
(Adam Tech)
2. How to Pass a mapping variable parameter to a B2B Data Transformation Project
(Informatica Support)
3. How to Create and Use Parameter Set in IDQ
(Informatica Support)
4. Understanding Parameter files in PowerCenter
(Informatica Support)
5. INFORMATICA Mapping | Mapping
(Dinesh Reddyvari)
6. Parameter | Session Parameter | Mapping Parameter
(Green Tech)

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