informatica fastexport reader with teradata

Informatica FastExport Reader

Applies to: Informatica 8.6.1

Summary This document is about the usage of FastExport Reader utility in Informatica 8.6.1. It

describes the operational features, capabilities of the utility and the configuring options.

Author Bio Author(s): Madhusudhanan V

Company: Wipro Technologies

Created on: September 19, 2009

Working as a Informatica developer .

TABLE OF CONTENTS

Purpose of the document ................................ ................................ ................................ .............. 3 Document Usage................................ ................................ ................................ .......................... 3 Details of Document ................................ ................................ ................................ ..................... 3 Steps to be followed ................................ ................................ ................................ ..................... 3 v Mapping level Steps : ................................ ................................ ................................ ............ 3 v Session level Steps : ................................ ................................ ................................ ............ 5 v Workflow level Steps :................................ ................................ ................................ ........... 5 Steps to create a new FastExport connection ................................ ................................ ............... 6 Limitations................................ ................................ ................................ ................................ .... 8


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Purpose of the documentInformatica FastExport Reader

This document provides a brief overview of FastExport Reader in Informatica.

It describes the operational features and capabilities of the utility.

Document Usage

The target audience of this document are: v Informatica Architects / Informatica Developer.

Details of Document

Preface

FastExport is a utility that establishes multiple sessions to quickly transfer large amounts of data

from tables and views of the Teradata Relational Database Management System(RDBMS)

to a client-based application. You can export data from any table or view to which you

have the SELECT access privilege. In Informatica we use FastExport utility when a

normal Relational reader takes more time to read records from a source.

Steps to be followed

v Mapping level Steps:

Create a mapping with a Teradata source database.



The mapping can include multiple source definitions from the same Teradata source

database joined in a single source qualifier transformation.

Create an SQL override; the PowerCenter uses it to create the FastExport control

file.

The select query in the SQL override should refer to the database from which the

data should be fetched.

For example, consider the Sql query given below,

In the above query the $$DBName is a Mapping variable which refers to a

Database and it is explicitly defined in the parameter file.

SELECT col1, col2, col3

FROM

$$DBName.Tbl_name

WHERE

Col1 = test



If you do not use an SQL override, PowerCenter generates a control file based on the

connected ports in the source qualifier.

v Session level Steps:

Create a session, in that use FastExport reader instead of Relational reader.

Use a FastExport connection to the Teradata tables you want to export in a session.

Override the control file for a session by defining a control file in the session

properties.

v Workflow level Steps:

To support FastExport the integration service option in the workflow should point to UNICODE

as shown below,



Steps to create a new FastExport connection

To create a FastExport connection Select ConnectionsApplications in the

Workflow Manager.

The Connection Browser dialog box will appear, in that click New to create a new

connection.

Select a Teradata FastExport connection and click OK, the dialog box will appear as

shown below,

Enter a name for the FastExport connection and enter the database username and

password.

FastExport has some attributes which will be assigned with some default values, the

values can be overridden by the user, based on their necessity and We can also define

the attribute values by passing the values through parameter file variables.



\

The below table lists the attributes and its default values of a FastExport connection,

Attribute Default value

TDPID n/a

Tenacity 4

Max Sessions 1

Sleep 6

Block Size 64000

Data Encryption Disabled

Logtable Name FE_

Executable Name fexp

Database Name n/a

The below table describes about the Parameter file variables to be used for the Connection

attributes,

Connection Attribute Parameter Variable

TDPID $_TDPIP

Tenacity $_Tenacity

Max Sessions $_Max_Sessions

Sleep $_Sleep

Block Size $_Block_Size

Logtable Name $_Logtable_Name

Executable Name $_Executable_Name

Database Name $_Database_Name



Listed below are some examples for the FastExport attribute variables defined in the Parameter file,

Where,

$AppConnectionTestDB refers to the FastExport ConnectionName,

$PMTempDir is used to define the path at which the ctl and output file will be created.

$Param_AppConnectionTestDB_Logtable_Name

$Param_AppConnectionTestDB_Database_name These variables are used to

$Param_AppConnectionTestDB_Max_Sessions define the FastExport

$Param_AppConnectionTestDB_Block_Size connection attributes.

Limitations v FastExport supports a maximum export file size of 2 GB on a UNIX MP-RAS

operating system. Other operating systems have no file size limitations.

v The exported data files cannot be concatenated.

v The session will fail if it contains both pre-session SQL command and FastExport.

$AppConnectionTestDB=_FastExport

$PMTempDir=$PMTgtFileDir\

$Param_AppConnectionTestDB_Logtable_Name=.test

$Param_AppConnectionTestDB_Database_name=

$Param_AppConnectionTestDB_Max_Sessions=64

$Param_AppConnectionTestDB_Block_Size=128000


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informatica fastexport reader with teradata

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