> ## Documentation Index
> Fetch the complete documentation index at: https://agno-v2.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# DB

> Store a vLLM agent's session history in Postgres and reuse it across turns.

```python db.py theme={null}
"""Run `uv pip install sqlalchemy` and ensure Postgres is running (`./cookbook/scripts/run_pgvector.sh`)."""

from agno.agent import Agent
from agno.db.postgres import PostgresDb
from agno.models.vllm import VLLM
from agno.tools.websearch import WebSearchTools

# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------

# Setup the database
db_url = "postgresql+psycopg://ai:ai@localhost:5532/ai"
db = PostgresDb(db_url=db_url)

agent = Agent(
    model=VLLM(id="Qwen/Qwen2.5-7B-Instruct"),
    db=db,
    tools=[WebSearchTools()],
    add_history_to_context=True,
)

agent.print_response("How many people live in Canada?")
agent.print_response("What is their national anthem called?")

# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------

if __name__ == "__main__":
    pass
```

## Run the Example

<Snippet file="create-venv-step.mdx" />

**1. Install dependencies**

```bash theme={null}
uv pip install -U agno "psycopg[binary]" ddgs openai sqlalchemy
```

**2. Export your vLLM API key**

```bash Mac/Linux theme={null}
export VLLM_API_KEY="your_vllm_api_key_here"
```

```bash Windows theme={null}
$Env:VLLM_API_KEY="your_vllm_api_key_here"
```

<Snippet file="run-pgvector-step.mdx" />

**3. Install vLLM**

Install vLLM in the environment that will serve the model:

```bash theme={null}
uv pip install -U vllm
```

**4. Start vLLM**

Serve the model used by this example:

```bash theme={null}
vllm serve Qwen/Qwen2.5-7B-Instruct
```

**5. Run the example**

Save the code above as `db.py`, then run:

```bash theme={null}
python db.py
```

Full source: [cookbook/90\_models/vllm/db.py](https://github.com/agno-agi/agno/blob/v3.0.4/cookbook/90_models/vllm/db.py)


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