# Schema preferences (Talend > Specific Settings)

## About this task

You can define the default data length and type of the schema fields of your components.

## Procedure

1. From the menu bar, click Window > Preferences to open the Preferences dialog box.
2. Expand the Talend node, and click Specific Settings > Default Type and Length to display the data length and type of your schema.

   ![Default Type and Length configuration in the Preferences dialog box.](https://help.qlik.com/talend/en-US/studio-user-guide/Resources/images/preferences_default_type_length.png)
3. Set the parameters according to your needs:
   * In the Default Settings for Fields with Null Values area, fill in the data type and the field length to apply to the null fields.
   * In the Default Settings for All Fields area, fill in the data type and the field length to apply to all fields of the schema.
   * In the Default Length for Data Type area, fill in the field length for each type of data.