A mapplet is a reusable object containing a set of transformations that you can use in multiple mappings. Use a mapplet in a mapping. Or, validate the mapplet as a rule. Transformations in a mapplet can be reusable or non-reusable. If you add a Sequence Generator transformation to a mapplet, it must be reusable.
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. 3) Provide Flexibility to run sessions for different files and databases.
A Workflow in Informatica is a set of multiple tasks connected with start task link and triggers the proper sequence to execute a process. When a workflow in Informatica is executed, it triggers a start task and other tasks connected in the workflow. A workflow is an engine which runs 'N' number of sessions / Tasks.
There are two types of sessions in Informatica: Non-reusable Session Task: Session Task that we created in the Workflow Designer is non-reusable. Reusable Session Task: Session Task that we created in Informatica Task Developer is reusable.
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.
There is a clear difference between variables and parameters. A variable represents a model state, and may change during simulation. A parameter is commonly used to describe objects statically. A parameter is normally a constant in a single simulation, and is changed only when you need to adjust your model behavior.
If the value that is passed through remains constant accross the session run, then it is a parameter. If the value changes accross the session run, then it is a variable.
Session property is a set of instructions that instructs Informatica how and when to move the data from source to targets. A session property is a task, just like other tasks that we create in workflow manager. A session can be a reusable object or non-reusable.
Parameter maps are objects that store key-value pairs. Each parameter map has two columns, one for the key and one for the value that the key represents. You can manually enter the keys and values, import them from a file, or base them on existing query items in the model. You can also export parameter maps to a file.
IsExprVar is a propertie thay you must set when you define a mapping parameter or variable. The default value is false which means that if you use a mapping parameter or variable in an expression, the Integration Service expands the parameter or variable after it parses the expression.
- When using STOP option the integration services stop reading the data from the source of the file, whereas ABORT waits for the services to be finished and then only any actions take place. - The STOP command processes the data to the source or to targets, whereas ABORT option has the timeout period of 60 seconds.
When using incremental aggregation, you apply captured changes in the source to aggregate calculations in a session. If the source changes incrementally and you can capture changes, you can configure the session to process those changes.
Pushdown optimization increases mapping performance when the source database can process transformation logic faster than the Data Integration Service. The Data Integration Service applies pushdown optimization to a mapping when you select the pushdown type in the mapping run-time properties.
List of Transformations in Informatica
- Source Qualifier Transformation.
- Aggregator Transformation.
- Router Transformation.
- Joiner transformation.
- Rank Transformation.
- Sequence Generator Transformation.
- Transaction Control Transformation.
- Lookup and Re-usable transformation.
Swift inout parameters allow you to change an input passed into a function inside that function. As you may know, changing the value of a parameter passed into a function is not possible, as they are constants.
Output parameters. An output parameter, also known as an out parameter or return parameter, is a parameter used for output, rather than the more usual use for input.
An input parameter is a placeholder for a value or values in a mapping. You define the value of the parameter when you configure the. mapping. task. You can create an input parameter for logical aspects of a data flow.
A workflow variable represents a value that can change during a workflow run. After you create a user-defined workflow variable, you configure the workflow to assign a run-time value to the variable. Assign workflow variables to task input and task output to pass data between a task and the workflow.
The Normalizer transformation is an active transformation that transforms one incoming row into multiple output rows. When the Normalizer transformation returns multiple rows from an incoming row, it returns duplicate data for single-occurring incoming columns.
A target load order group is the collection of source qualifiers, transformations, and targets linked together in a mapping. You can set the target load order if you want to maintain referential integrity when inserting, deleting, or updating tables that have the primary key and foreign key constraints.
In the mapping task, define the parameter details.
- Select the Connection Name from the drop down if the connection is parameterized.
- Select the Source Type as Single.
- Select the default data object.
- On the Schedule tab, enter the parameter file directory and file name.
Informatica tracing levels can be configured at the transformation session levels and has 4 different types of tracing levels. None – This level is applicable at session level only and the integration service uses the tracing levels configured in the mapping.
A mapping parameter represents a constant value that you can define before running a session. During the session, the Informatica Server evaluates all references to the parameter to that value. Mapping Variables. Unlike a mapping parameter, a mapping variable represents a value that can change through the session.
The repository stores information required to extract, transform, and load data. It also stores administrative information such as permissions and privileges for users and groups that have access to the repository. You administer the repository through Informatica Administrator and command line programs.
A grid is an alias assigned to a group of nodes that allows you to automate the distribution of workflows and sessions across nodes. A Load Balancer distributes tasks to nodes without overloading any node. When you use a grid, the Integration Service distributes workflow tasks and session threads across multiple nodes.
The Repository Service is a separate, multi-threaded process that retrieves, inserts, and updates metadata in the repository database tables. The Repository Service ensures the consistency of metadata in the repository.
The PowerCenter server components comprises of the following services: Repository service: The Repository service manages the repository. It retrieves, inserts, and updates metadata into the repository database tables. Integration service: The Integration service runs sessions and workflows.
Informatica PowerCenter Repository Manager is a GUI based Administrative client component, which allows user to create new domains and used to organize the meta data stored in the Repository. Folders in Repository are used to organize the meta data. Perform folder functions : Can Create, edit, copy, and delete folders.
PowerCenter Repository Service
| Database Information | Description |
|---|
| PowerCenter repository database type | Database type for the PowerCenter repository. The PowerCenter repository supports IBM DB2 UDB, Microsoft SQL Server, Oracle, or Sybase ASE. |
Informatica Administrator is an application client that consolidates the administrative tasks for domain objects such as services, connections, and licenses. Use the Administrator tool to manage the domain and the security of the domain. Run a Web Services Report or License Management Report.
The maximum numeric precision allowed in PowerCenter/Cloud Data Integration is 28 digits.
Informatica PowerCenter is an ETL tool that is used to enterprise extract, transform, and load the data from the sources. The Informatica PowerCenter is extracting data from its source, transforming this data according to requirements, and loading this data into a target data warehouse.
