> For the complete documentation index, see [llms.txt](https://docs.bdb.ai/bdb-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bdb.ai/bdb-documentation/data-pipeline/components/writers/rdbms-writer.md).

# RDBMS Writer

### Configuration

All component configurations are classified broadly into 3 section

* [Basic ](/bdb-documentation/data-pipeline/components/component-base-configuration.md)
* Metadata
* [Resource Configuration](/bdb-documentation/data-pipeline/components/resource-configuration.md)

Please follow the demonstration to configure the component.

![](/files/uIndLy6QiW0vS22GCJOt)

### Save Modes

RDBMS writers supports 3 save modes

#### Append

Add new records

#### Overwrite

This mode truncates the table and add fresh records.  after every run you will get records which are part of the last run

#### Upsert

This operation allows the users to insert a new record or update existing data into a table. For configuring this we need provide the key. 

We support composite key based upsert, in case of composite key, we can specify the second key by using comma separator eg:- *key1, key2*


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.bdb.ai/bdb-documentation/data-pipeline/components/writers/rdbms-writer.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.