IBM DB2 vector store documentation addition (#31008)

Author: yiweiHeOSS

docs/docs/integrations/providers/ibm.mdx

@@ -1,7 +1,9 @@
 # IBM
 
-The `LangChain` integrations related to [IBM watsonx.ai](https://www.ibm.com/products/watsonx-ai) platform.
+LangChain integrations related to IBM technologies, including the
+[IBM watsonx.ai](https://www.ibm.com/products/watsonx-ai) platform and DB2 database.
 
+## Watsonx AI
 IBM® watsonx.ai™ AI studio is part of the IBM [watsonx](https://www.ibm.com/watsonx)™ AI and data platform, bringing together new generative 
 AI capabilities powered by [foundation models](https://www.ibm.com/products/watsonx-ai/foundation-models) and traditional machine learning (ML) 
 into a powerful studio spanning the AI lifecycle. Tune and guide models with your enterprise data to meet your needs with easy-to-use tools for 
@@ -14,7 +16,7 @@ Watsonx.ai offers:
 - **Hybrid, multi-cloud deployments:** IBM provides the flexibility to integrate and deploy your AI workloads into your hybrid-cloud stack of choice.
 
 
-## Installation and Setup
+### Installation and Setup
 
 Install the integration package with
 ```bash
@@ -28,52 +30,75 @@ import os
 os.environ["WATSONX_APIKEY"] = "your IBM watsonx.ai api key"
 ```
 
-## Chat Model
+### Chat Model
 
-### ChatWatsonx
+#### ChatWatsonx
 
 See a [usage example](/docs/integrations/chat/ibm_watsonx).
 
 ```python
 from langchain_ibm import ChatWatsonx
 ```
 
-## LLMs
+### LLMs
 
-### WatsonxLLM
+#### WatsonxLLM
 
 See a [usage example](/docs/integrations/llms/ibm_watsonx).
 
 ```python
 from langchain_ibm import WatsonxLLM
 ```
 
-## Embedding Models
+### Embedding Models
 
-### WatsonxEmbeddings
+#### WatsonxEmbeddings
 
 See a [usage example](/docs/integrations/text_embedding/ibm_watsonx).
 
 ```python
 from langchain_ibm import WatsonxEmbeddings
 ```
 
-## Reranker
+### Reranker
 
-### WatsonxRerank
+#### WatsonxRerank
 
 See a [usage example](/docs/integrations/retrievers/ibm_watsonx_ranker).
 
 ```python
 from langchain_ibm import WatsonxRerank
 ```
 
-## Toolkit
+### Toolkit
 
-### WatsonxToolkit
+#### WatsonxToolkit
 
 See a [usage example](/docs/integrations/tools/ibm_watsonx).
 
 ```python
 from langchain_ibm import WatsonxToolkit
 ```
+
+## DB2
+
+### Vector stores
+
+#### IBM DB2 Vector Store and Vector Search
+
+The IBM DB2 relational database v12.1.2 and above offers the abilities of vector store
+and vector search. Installation of `langchain-db2` package will give Langchain users
+the support of DB2 vector store and vector search.
+
+See detailed usage examples in the guide [here](/docs/integrations/vectorstores/db2).
+
+Installation: This is a seperate package for vector store feature only and can be run
+without the `langchain-ibm` package.
+```bash
+pip install -U langchain-db2
+```
+Usage:
+```python
+from langchain_db2 import db2vs
+from langchain_db2.db2vs import DB2VS
+```