August 17, 2023

tDB2CDC – Docs for ESB 5.x

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tDB2CDC

tdb2cdc_white.png

tDB2CDC properties

Component family

Databases/DB2

  

Function

tDB2CDC extracts the data from a
source system which has changed since the last extraction and
transports it to another/other system(s).

Purpose

tDB2CDC addresses data extraction
and transportation needs. tDB2CDC
only extracts the changes done to the source operational data and
makes them available to the target system(s) using database CDC
views.

Basic settings

Property type

Either Built-in or Repository.

 

 

Built-in: No property data stored
centrally.

 

 

Repository: Select the repository
file where Properties are stored. The fields that come after are
pre-filled in using the fetched data.

Warning

Reset the DB type by clicking the relevant button to
select the CDC connection.

 

Use an existing connection

Select this check box and in the Component List click the
relevant connection component to reuse the connection details you already defined.

Note

When a Job contains the parent Job and the child Job, if you need to share an existing
connection between the two levels, for example, to share the connection created by the
parent Job with the child Job, you have to:

  1. In the parent level, register the database connection to be shared in the
    Basic settings view of the connection
    component which creates that very database connection.

  2. In the child level, use a dedicated connection component to read that
    registered database connection.

For an example about how to share a database connection across Job levels, see
Talend Studio User
Guide.

 

Host name

Database server IP address.

 

Port

DB server listening port number.

 

Database

Name of the database.

 

Schema

Name of the schema

 

Username and
Password

DB user authentication data.

To enter the password, click the […] button next to the
password field, and then in the pop-up dialog box enter the password between double quotes
and click OK to save the settings.

 

Schema using CDC and Edit
Schema

A schema is a row description. It defines the number of fields to be processed and passed on
to the next component. The schema is either Built-In or
stored remotely in the Repository.

 

 

Built-in: The schema is created
and stored locally for this component only. Related topic: see
Talend Studio User
Guide.

 

 

Repository: The schema already
exists and is stored in the Repository, hence can be reused. Related
topic: see Talend Studio User
Guide.

Warning

Reset the DB type by clicking the relevant button to
select the schema of the CDC connection.

   

Click Edit schema to make changes to the schema. If the
current schema is of the Repository type, three options are
available:

  • View schema: choose this option to view the
    schema only.

  • Change to built-in property: choose this option
    to change the schema to Built-in for local
    changes.

  • Update repository connection: choose this option to change
    the schema stored in the repository and decide whether to propagate the changes to
    all the Jobs upon completion. If you just want to propagate the changes to the
    current Job, you can select No upon completion and
    choose this schema metadata again in the [Repository
    Content]     window.

 

Table name

Select the source table where to capture any changes made on data.

 

Subscriber

Enter the name of the application that will use the change
table.

 

Events to catch

Insert: Select this check box to
catch the data inserted in the change table since the last
extraction.

Update: Select this check box to
catch the data updated in the change table since the last
extraction.

Delete: Select this check box to
catch the data deleted in the change table since the last
extraction.

Advanced settings

Additional JDBC parameters

Specify additional connection properties for the DB connection you
are creating.

Note

You can set the encoding parameters through this field.
 

Keep data in CDC Table

Select this check box to keep the changes made available to one or
more target systems, even after they have been consulted.

 

Trim all the String/Char columns

Select this check box to remove leading and trailing whitespace
from all the String/Char columns.

 

Trim column

Remove leading and trailing whitespace from defined
columns.

Note

Deselect Trim all the String/Char
columns to enable Trim columns in this
field.

 

tStatCatcher Statistics

Select this check box to collect log data at the component
level.
  Enable parallel execution

Select this check box to perform high-speed data processing, by treating multiple data flows
simultaneously. Note that this feature depends on the database or the application ability to
handle multiple inserts in parallel as well as the number of CPU affected. In the Number of parallel executions field, either:

  • Enter the number of parallel executions desired.

  • Press Ctrl + Space and select the appropriate
    context variable from the list. For further information, see Talend Studio
    User Guide    .

Note that when parallel execution is enabled, it is not possible to use global variables to
retrieve return values in a subjob.

Warning

  • The Action on table
    field is not available with the parallelization function. Therefore, you
    must use a tCreateTable component if you
    want to create a table.

  • When parallel execution is enabled, it is not possible to use global
    variables to retrieve return values in a subjob.

Global Variables 

NB_LINE: the number of rows processed. This is an After
variable and it returns an integer.

ERROR_MESSAGE: the error message generated by the
component when an error occurs. This is an After variable and it returns a string. This
variable functions only if the Die on error check box is
cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable
functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl +
Space to access the variable list and choose the variable to use from it.

For further information about variables, see Talend Studio
User Guide.

Usage

This component is used as a start component. It requires an output
component and row Main link.

Log4j

The activity of this component can be logged using the log4j feature. For more information on this feature, see Talend Studio User
Guide.

For more information on the log4j logging levels, see the Apache documentation at http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html.

Limitation

This component requires installation of its related jar files. For more information about the
installation of these missing jar files, see the section describing how to configure the
Studio of the Talend Installation and Upgrade Guide.

 

Related scenario

For a related scenario, see Scenario 2: Retrieving modified data using CDC.

Document get from Talend https://help.talend.com
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