---
title: "Delta Generation"
canonical: "https://docs.vaultspeed.com/space/VPD/3012460559/Delta%20Generation"
format: markdown
---
In the **Delta Generation** submenu, you can generate the **changed** DDL and/or ETL/ELT Code.

Select the desired settings from the Drop-Down Lists :

- **Project**
- **Data Vault**
- **Old Data Vault Release **(has to be a production release)
- **New Data Vault Release**
- **Old Business Vault Release**
- **New Business Vault Release**
- **ETL Generation Type**: Depending on the Database Type, different ETL Generation Types can be available. For e.g. choose one of the following for an Oracle DataBase: Oracle ODI Groovy, Oracle SQL, or Talend JobScript Oracle.

> ℹ️ if you have breaking changes to your model, some migrations are automatically supported by VaultSpeed.  Details on this can be found here: [https://vaultspeed.atlassian.net/wiki/spaces/VPD/pages/3081437259](https://vaultspeed.atlassian.net/wiki/spaces/VPD/pages/3081437259)

The process is very similar to the Full Generation, except for the fact that this option will only generate code for objects that have changed in a certain Release (either Data Vault and/or Business Vault). In order to do this, you have to enter both the old and new data vault and/or business vault releases. As a result:

- Generated DDL Code will contain the create and/or alter statements needed to modify a deployed data vault and/or business vault to the new version.
- Generated ETL Code will contain the changed ETL code for the Initial Load and the Incremental Load and when necessary some migration scripts.

Source Selection and Load Type Selection are not available with this Option.

All the Delta Code is generated, no Selections on which Part of the Code you want to generate are available.

![image](media://37ead5c6-4765-4462-8916-53e602c5fea3)

The generated code will be downloaded to you VaultSpeed agent in a file named ‘<id>_COMP.zip’.

Since Release 5.5, the generated code also contains a Markdown file in the DOC folder, containing a llist of all the changes.

![image](media://07ec5b0f-54af-4608-86da-c710b563034c)