# ChatVectorDBChain

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/ChatVectorDBChain)

Chain for chatting with a vector database.

## Signature

```python
ChatVectorDBChain()
```

## Extends

- `BaseConversationalRetrievalChain`

## Properties

- `vectorstore`
- `top_k_docs_for_context`
- `search_kwargs`

## Methods

- [`from_llm()`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/ChatVectorDBChain/from_llm)

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/b302691ff9ad841804e93e5addbdc53b6974473b/libs/langchain/langchain_classic/chains/conversational_retrieval/base.py#L498)