Function |
tParAccelSCD reflects and tracks changes in a dedicated ParAccel SCD table. | |
Purpose |
tParAccelSCD addresses Slowly Changing Dimension needs, reading regularly a source of data and logging the changes into a dedicated SCD table |
Component family |
Databases/ParAccel | |
Basic settings |
Property type |
Either Built-in or Repository. Since version 5.6, both the Built-In mode and the Repository mode are available in any of the Talend solutions. |
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Built-in: No property data stored centrally. |
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Repository: Select the Repository file where properties are stored. The following fields are pre-filled in using fetched data. |
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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. NoteWhen 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:
For an example about how to share a database connection across Job levels, see Talend Studio User Guide. |
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Connection type |
Select the relevant driver on the list. |
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Host |
Database server IP address. |
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Port |
Listening port number of DB server. |
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Database |
Name of the database. |
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Schema |
Name of the DB schema. |
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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. |
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Table |
Name of the table to be written. Note that only one table can be written at a time. |
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Schema and Edit schema |
A schema is a row description. It defines the number of fields (columns) to be processed and passed on to the next component. The schema is either Built-In or stored remotely in the Repository. Since version 5.6, both the Built-In mode and the Repository mode are available in any of the Talend solutions. Click Edit schema to make changes to the schema. If the current schema is of the Repository type, three options are available:
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Built-in: The schema is created and stored locally for this component only. Related topic: see Talend Studio User Guide. |
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Repository: The schema already exists and is stored in the Repository, hence can be reused. Related topic: see Talend Studio User Guide. |
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SCD Editor |
The SCD editor helps to build and configure the data flow for slowly changing dimension outputs. For more information, see SCD management methodologies. |
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Use memory saving Mode |
Select this check box to maximize system performance. |
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Source keys include Null |
Select this check box to allow the source key columns to have Null values. WarningSpecial attention should be paid to the uniqueness of the source key(s) values when this option is selected. |
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Die on error |
This check box is cleared by default, meaning to skip the row on error and to complete the process for error-free rows. |
Advanced settings |
End date time details |
Specify the time value of the SCD end date time setting in the format of HH:mm:ss. The default value for this field is 12:00:00. This field appears only when SCD Type 2 is used and Fixed year value is selected for creating the SCD end date. For more information about SCD Type 2, see SCD management methodologies. |
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Debug mode |
Select this check box to display each step during processing entries in a database. |
tStatCatcher Statistics |
Select this check box to collect log data at the component level. | |
Dynamic settings |
Click the [+] button to add a row in the table and fill the Code field with a context variable to choose your database connection dynamically from multiple connections planned in your Job. This feature is useful when you need to access database tables having the same data structure but in different databases, especially when you are working in an environment where you cannot change your Job settings, for example, when your Job has to be deployed and executed independent of Talend Studio. The Dynamic settings table is available only when the Use an existing connection check box is selected in the Basic settings view. Once a dynamic parameter is defined, the Component List box in the Basic settings view becomes unusable. For examples on using dynamic parameters, see Scenario 3: Reading data from MySQL databases through context-based dynamic connections and Scenario: Reading data from different MySQL databases using dynamically loaded connection parameters. For more information on Dynamic settings and context variables, see Talend Studio User Guide. | |
Global Variables |
NB_LINE_UPDATED: the number of rows updated. This is an After variable and it returns an integer. NB_LINE_INSERTED: the number of rows inserted. This is an After variable and it returns an integer. NB_LINE_REJECTED: the number of rows rejected. 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 Output component. It requires an Input component and Row main link as input. | |
Limitation |
Due to license incompatibility, one or more JARs required to use this component are not provided. You can install the missing JARs for this particular component by clicking the Install button on the Component tab view. You can also find out and add all missing JARs easily on the Modules tab in the Integration perspective of your studio. For details, see the article Installing External Modules on Talend Help Center (https://help.talend.com) how to configure the Studio in the Talend Installation and Upgrade Guide. |
For related scenarios, see tMysqlSCD.