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+# S3, Lambda and Lance
+
+## Store your data on S3 and use Lambda to compute embeddings and retrieve queries in production easily.
+
+This is a great option if you're wanting to scale with your use case and save effort and costs of maintenance.
+
+Let's walk through how to get a simple Lambda function that queries the SIFT dataset on S3.
+
+Before we start, you'll need to ensure you create a secure account access to AWS. We recommend using user policies, as this way AWS can share credentials securely without you having to pass around environment variables into Lambda.
+
+We'll also use a container to ship our Lambda code. This is a good option for Lambda as you don't have the space limits that you would otherwise by building a package yourself.
+
+First, let's create a new `Dockerfile` using the AWS python container base:
+
+```docker
+FROM public.ecr.aws/lambda/python:3.10
+
+RUN pip3 install --upgrade pip
+RUN pip3 install --no-cache-dir -U numpy --target "${LAMBDA_TASK_ROOT}"
+RUN pip3 install --no-cache-dir -U pylance --target "${LAMBDA_TASK_ROOT}"
+
+COPY app.py ${LAMBDA_TASK_ROOT}
+
+CMD [ "app.handler" ]
+```
+
+Now let's make a simple Lambda function that queries the SIFT dataset, and allows the user to enter a vector and change the nearest neighbour parameter in `app.py`.
+
+```python    
+import time
+import json
+
+import numpy as np
+import lance
+from lance.vector import vec_to_table
+
+s3_dataset = lance.dataset("s3://eto-public/datasets/sift/vec_data.lance")
+
+def handler(event, context):
+    status_code = 200
+    num_k = 10
+
+    if event['query_vector'] is None:
+        status_code = 404
+        return {
+            "statusCode": status_code,
+            "headers": {
+                "Content-Type": "application/json"
+            },
+            "body": json.dumps({
+                "Error ": "No vector to query was issued"
+            })
+        }
+    
+    # Shape of SIFT is (128,1M), d=float32
+    query_vector = np.array(event['query_vector'], dtype=np.float32)
+    
+    if event['num_k'] is not None:
+        num_k = event['num_k']
+    
+    if event['debug'] is not None:
+        rs = s3_dataset.to_table(nearest={"column": "vector", "k": num_k, "q": query_vector})
+    else:
+        rs = s3_dataset.to_table(nearest={"column": "vector", "k": num_k, "q": query_vector})
+
+    return {
+        "statusCode": status_code,
+        "headers": {
+            "Content-Type": "application/json"
+        },
+        "body": rs.to_pandas().to_json()
+    }```