# Centralizing a Validation Rule

Available in...

* Big Data
* Big Data Platform
* Cloud API Services Platform
* Cloud Big Data
* Cloud Big Data Platform
* Cloud Data Fabric
* Cloud Data Integration
* Cloud Data Management Platform
* Data Fabric
* Data Integration
* Data Management Platform
* Data Services Platform
* Qlik Talend Cloud Enterprise Edition
* Qlik Talend Cloud Premium Edition
* Real-Time Big Data Platform

A validation rule is a basic or integrity rule that you can apply to metadata items to check the validity of your data. It can be basic check for correct values or referential integrity check, both applicable to database tables or individual columns, file metadata or any relevant metadata item.

This feature is not shipped with Talend Studio by default. You need to install it using the Feature Manager. For more information, see [Installing features using the Feature Manager](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/install-features-to-talend-studio).

All your business and validation rules can now be centralized in Repository metadata which will enable you to modify, activate, deactivate and delete them according to your need.

They can be defined either from the Validation Rules metadata entry or directly from the metadata schema or columns you want to check and they are to be used in your Job designs at the component level. Data that did not pass the validation check can easily be retrieved through a reject link for a further treated, if necessary.

To see how to use a validation rule in a Job design, see [Data Integration Job Examples](https://help.qlik.com/talend/en-US/data-integration-job-examples/8.0).

### In this section

* [Defining the general properties of a validation rule](https://help.qlik.com/talend/en-US/studio-user-guide/8.0-R2026-07/defining-general-properties-of-validation-rule)
* [Selecting the schema to validate](https://help.qlik.com/talend/en-US/studio-user-guide/8.0-R2026-07/selecting-schema-to-validate)
* [Selecting the trigger and type of validation](https://help.qlik.com/talend/en-US/studio-user-guide/8.0-R2026-07/selecting-trigger-and-type-of-validation)
* [Handling rejected data](https://help.qlik.com/talend/en-US/studio-user-guide/8.0-R2026-07/handling-rejected-data)