---
title: "Extract the metadata of a source"
description: "Further, choose Sample data or Complete data to extract on the first 1,000 rows or on the entire table respectively"
url: https://docs.ovhcloud.com/en/guides/public-cloud/data-platform/connectors-analyzer-extract-metadata
lang: en
lastUpdated: 2026-09-14
---
> For AI agents: the complete documentation index is available at https://docs.ovhcloud.com/en/llms.txt, the full documentation bundle is available at https://docs.ovhcloud.com/en/llms-full.txt.

# Extract the metadata of a source

## Objective

To extract the metadata of a source for the first time, simply select a source object on the left-hand panel. This will parse a sample of 1,000 rows from the source to obtain the following information:

- attribute names
- attribute types
- attribute minimum and maximum values
- attribute card., i.e. the number of unique values in the sample
- attribute null values

![analyzer](/images/public-cloud/data-platform/product/connectors/analyzer/picts/analyzer-1.png)
To extract the metadata of a source again, you can click on the **Extract Metadata** button at the top right. Further, choose _Sample data_ or _Complete data_ to extract on the first 1,000 rows or on the entire table respectively.

:::info
A _complete_ metadata extraction can take a while depending on the size of the selected table
:::

![analyzer](/images/public-cloud/data-platform/product/connectors/analyzer/picts/analyzer-2.png)
:::warning
If your metadata extraction fails, investigate why by checking out the **logs in the Jobs tab** in the Connectors.
:::

Once the meta are extracted, you can start working to set standard structure formats for your data by adding blueprint rules to any attribute.

![analyzer](/images/public-cloud/data-platform/product/connectors/analyzer/picts/analyzer-3.png)
[Learn how to add blueprint rules](https://docs.ovhcloud.com/en/guides/public-cloud/data-platform/connectors-analyzer-blueprint-rules.md)

## Go further

If you need training or technical assistance to implement our solutions, contact your sales representative or click on [this link](https://www.ovhcloud.com/en-gb/professional-services/) to get a quote and ask our Professional Services experts for a custom analysis of your project.

Ask questions, give your feedback and interact directly with the team building the Data Platform on the dedicated [Discord channel](https://discord.gg/ovhcloud).

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