Download - Informatica Mapping

Suggested Naming Conventions

Transformations

• Aggregator AGG_TransformationName

• Expression EXP_TransformationName

• Filter FIL_TransformationName

• Joiner JNR_TransformationName

• Lookup LKP_TransformationName

• Normalizer NRM_TransformationName

• Rank RNK_TransformationName

• Sequence Generator SEQ_TransformationName

• Stored Procedure SP_TransformationName

• Source Qualifier SQ_TransformationName

• Update Strategy UPD_TransformationName

Suggested Naming Conventions

Targets

• T_TARGETNAME

Mappings

• m_MappingName

Mapplets

• mplt_MappletName

Sessions

• s_MappingName

Mapping Designer

Ports

• To design the basic flow of data between source and targets

• Types: input, output, variable

Variable Ports

For aggregator, expression and rank transformations

Use variable to

• simplify complex expression

• store temporary data

• store values from prior rows

Provides Wizards to create simple pass through mappings/Slowly changing dimensions

Mapping Creation

How to create a Mapping?

• Open the Mapping designer workspace

• Choose Mappings > Create

• Give a proper name to the mapping

• Open the Sources from the navigator which you would have created/imported using source analyzer

• Drag and drop the source table from navigator into the workspace

Mapping Creation

Mapping Creation

• Choose Transformation > Create to create a transformation object

• Select the type of transformation object you want to create and give a proper name to it

Mapping Creation

• Drag and drop the required fields(ports) from Source Qualifier to the transformation object

Mapping Creation

• Add new ports in the transformation object and define them as variable ports to do complex transformation

Mapping Creation

• Open the Targets from the navigator which you would have created/imported using Warehouse Designer

• Select the target table, drag and drop it into the designer workspace

Mapping Creation

• Drag and drop the output ports from the last transformation object to the corresponding ports in the target

• Choose Repository > Save to store the mapping

• Check the output window for any errors

Mapping Wizards

Wizards help to create mappings quickly and easily

Wizards designed to create mappings for loading and maintaining star schemas

Mappings created using wizards can be edited and customized

Getting Started Wizard

• Simple Pass Through

• mappings to load static fact and dimensions

• Use this when you want to drop all existing data from the table before loading new data

• Slowly Growing Target

• mappings to load slowly growing dimension or fact tables

• Use this to load new data when existing data does not require updates

Mapping Wizards

Slowly Changing Dimensions Wizard

• Type I Dimension Mapping

- Keep most recent values in target

Emp id Name Email

1001 Shane [email protected]

Emp id Name Email


Emp id Name Email


Emp id Name Email


Source

Source Target

Target

[email protected]

Mapping Wizards


• Type II Dimension Mapping

Version Data Mapping

- insert new and changed dimensions with version number and incremented primary key

- full history and progress of changes

Emp id Name Email


PM_PRIMARYKEY

Emp id

Name Email PM_VERSION_NUMBER

1000 10 Shane [email protected]

0

Source

Target

Type II Dimension/Versioning

Emp id

Name Email


Source

Target

PM_PRIMARYKEY

Emp id



0


1

Type II Dimension/Versioning

Emp id

Name Email


Source

Target

PM_PRIMARYKEY

Emp id



0


1


2

Mapping Wizards



Flag Current Mapping

- insert new and changed dimensions with flags and incremented primary key

- full history and flagging only current dimensions

Emp id Name Email


PM_PRIMARYKEY

Emp id

Name Email PM_CURRENT_FLAG


1

Source

Target

Type II Dimension/Flag Current

Emp id

Name Email


Source

Target

PM_PRIMARYKEY

Emp id



N


Y

Type II Dimension/Flag Current

Emp id

Name Email


Source

Target

PM_PRIMARYKEY

Emp id



N


N


Y

Mapping Wizards



• Effective Date Range Mapping

- insert new and changed dimensions with date range to define current dimension data

- full history and tracking changes with an exact effective date range

Emp id

Name Email


PM_PRIMARYKEY

Emp id

Name Email PM_BEGIN_DATE

PM_END_DATE


01/01/00

SourceTarget

Type II Dimension/Effective Date

Emp id

Name Email


Source

Target

PM_PRIMARYKEY

Emp id Name Email PM_BEGIN_DATE

PM_END_DATE


01/01/00 03/01/00


03/01/00

Type II Dimension/Effective Date

Emp id

Name Email


Source

Target

PM_PRIMARYKEY

Emp id

Name Email PM_BEGIN_DATE

PM_END_DATE


01/01/00 03/01/00


03/01/00 05/02/00


05/02/00

Mapping Wizards


• Type III Dimension Mapping

- insert new and update values in existing dimensions

- keep current and previous values (partial history)

Emp id

Name Email


PM_PRIMARYKEY

Emp id

Name Email PM_Prev_ColumnName

PM_EFFECT_DATE


01/01/00

Source

Target

Type III Dimension

Emp id

Name Email


Source

Target

PM_PRIMARYKEY

Emp id Name Email PM_Prev_ColumnName

PM_EFFECT_DATE


[email protected]

01/02/00

Type III Dimension

Emp id

Name Email


Source

Target

PM_PRIMARYKEY

Emp id

Name Email PM_Prev_ColumnName

PM_EFFECT_DATE


[email protected]

01/03/00

Mapplet Designer

Mapplet

• Reusable object that reflect set of transformation logic to use in multiple mappings

• Like a single transformation object

• Expands at run time

Each Mapplet must include the following

• Exactly one input transformation or Source Qualifier transformation

• At least one output transformation

Rules for Objects in Mapplets

• Use only reusable Sequence Generators

• Do not use pre- or post-session stored procedures

Mapplet Designer

Rules for Objects in Mapplets

• Do not use the following in a mapplet

Joiner

Cobol Source definition

Normalizer

Target definitions

Mapplet Designer

How to create a Mapplet?

• Open the Mapplet designer workspace

• Choose Mapplets > Create

• Give a name to the Mapplet

• Create an input transformation to define mapplet input ports if the mapplet contains no sources

Creating a Mapplet

• Double click on the object to define the input ports

Creating a Mapplet

• Create the transformation objects to be used in the mapplet

• One input transformation can be connected to only one transformation, so to pass same values to two separate data flows,connect the input transformation to another transformation and then split the data flow

• Use Output transformation to create output ports, creating one Output transformation for each mapplet output group

• Connect all the input ports, ports in transformation objects and the output ports to complete the data flow

Creating a Mapplet

• Choose Repository > Save to store the mapplet• Check the output window for validation status• If mapplet is not valid,correct the problem and re-save the

mapplet

Replacing a relational database connection

• You can replace a relational database connection with another relational database connection.

• For example, you might have several sessions that you want to write to another target database. Instead of editing the properties for each session, you can replace the relational database connection for all sessions in the repository that use the connection.

Work Flow Manager

• In the Workflow Manager, you define a set of instructions called a workflow to execute mappings you build in the Designer.

• Generally, a workflow contains a session and any other task you may want to perform when you execute a session. Tasks can include a session, email notification, or scheduling information. You connect each task with links in the workflow.

• You can also create a worklet in the Workflow Manager. A worklet is an object that groups a set of tasks

Replacing a relational database connection

•Workflow manager>Connections>Replace

Working with tasks

Type of Tasks

• Command • Decision• Event• Email• Timer • Assignment• Session

Command

• The Command task allows you to specify one or more shell commands to run during the workflow. For example, you can specify shell commands in the Command task to delete reject files, copy a file, or archive target files.

• You can use a Command task in the following ways:

Standalone Command task: You can use a Command task anywhere in the workflow or worklet to run shell commands.

Pre- and post-session shell command: You can call a Command task as the pre- or post-session shell command for a Session task.

Command (Cntnd…)

Decision

Decision

•The Decision task allows you to enter a condition that determines the execution of the workflow, similar to a link condition.

•The Decision task has a pre-defined variable called $Decision_task_name.Condition that represents the result of the decision condition.

•The Informatica Server evaluates the condition in the Decision Task and sets the pre-defined condition variable to True (1) or False (0).

•You can use the Decision task instead of multiple link conditions in a workflow

Decision (Contd…)

Event

•You can define events in the workflow to specify the sequence of task execution. The event is triggered based on the completion of the sequence of tasks. Use the following tasks to help you use events in the workflow: Event-Raise task. Event-Raise task represents a user-defined event. Use the Event-Raise task with the Event-Wait task to define events.

Event-Wait task. The Event-Wait task waits for an event to occur. Once the event triggers, the Informatica Server continues executing the rest of the workflow.

Pre-defined event. A pre-defined event is a file-watch event. For pre-defined events, use an Event-Wait task to instruct the Informatica (Indicator File)

User-defined event. A user-defined event is a sequence of tasks in the workflow.

Event(Contd..)

Event (Contd…)

Email

•The Workflow Manager provides an Email task that allows you to send email during a workflow.

•You can create reusable Email tasks in the Task Developer for any type of email. Or, you can create non-reusable Email tasks in the Workflow and Worklet Designer.

You can use Email tasks in any of the following locations:

Session properties

Workflow properties

Workflow or worklet

Email(Contd…)

Timer

•The Timer task allows you to specify the period of time to wait before the Informatica Server executes the next task in the workflow.

•You can choose to start the next task in the workflow at an exact time and date.

•You can also choose to wait a period of time after the start time of another task, workflow, or worklet before starting the next task.

The Timer task has two types of settings:

Absolute time.

Relative time.

Timer(Contd..)

Assignment

•The Assignment task allows you to assign a value to a user-defined workflow variable.

Session

Session Session

•You create a Session task for each mapping you want the Informatica Server to run. The Informatica Server uses the instructions configured in the session to move data from sources to targets.

Worklet

•A worklet is an object that represents a set of tasks. It can contain any task available in the Workflow Manager.

•You can also nest a worklet in another worklet.

WorkFlow Monitor

• The Workflow Monitor is a tool that allows you to monitor workflows and tasks.

• You can view details about a workflow or task in either Gantt Chart view or Task view.

• You can run, stop, abort, and resume workflows from the Workflow Monitor.

Workflow Monitor

•You can configure options specific to Gantt Chart and Task view.

WorkFlow Monitor

Gantt Chart View

WorkFlow Monitor

• Task View