opensearch-docs-cn/_dashboards/discover/index-discover.md

---
layout: default
title: Discover
nav_order: 20
has_children: true
---

# Discover

**Discover** is a tool for exploring your data in OpenSearch Dashboards. You can use **Discover** to visually represent your data on a dashboard and provide a high-level view of key metrics. 

The following image represents a typical **Discover** page using sample data.

<img src="{{site.url}}{{site.baseurl}}/images/dashboards/discover-app.png" alt="Discover start screen" width="700">

## Getting started

In this tutorial, you'll learn about using **Discover** to:

- Add data.
- Interpret and visualize data.
- Share the data findings.
- Set alerts.

## Prerequisites

The following are prerequisites for using **Discover**:

- Install [OpenSearch Dashboards 2.10 or later](https://opensearch.org/downloads.html).
- Add OpenSearch [sample data]({{site.url}}{{site.baseurl}}/dashboards/quickstart/) or import your own data into OpenSearch.
- Have a foundational understanding of OpenSearch [documents and indexes]({{site.url}}{{site.baseurl}}/im-plugin/index/).   

## Adding data

Data must be added to OpenSearch before it can be analyzed. In this tutorial, you'll use the sample data. To learn about importing your own data, see [Managing indexes]({{site.url}}{{site.baseurl}}/im-plugin/index/).

To add the sample data, follow these steps:

1. On the OpenSearch Dashboards home page, choose **Add sample data**.
2. Choose the desired sample data and select the **Add data** button. A screenshot of the **Add sample data** interface is shown in the following image.

<img src="{{site.url}}{{site.baseurl}}/images/dashboards/add-sample.png" alt="Add sample data interface"  width="700">

## Defining the search

To define a search, follow these steps:  

1. On the OpenSearch Dashboards navigation menu, select **Discover**.
2. Choose the data you want to work with. In this case, choose `opensearch_dashboards_sample_data_flights` from the upper-left dropdown menu. 
3. Select the calendar icon ({::nomarkdown}<img src="{{site.url}}{{site.baseurl}}/images/icons/calendar-oui.png" class="inline-icon" alt="calendar icon"/>{:/}) to change the time range of your search and then select **Refresh**.

You'll see a view similar to the one in the following image. 

<img src="{{site.url}}{{site.baseurl}}/images/dashboards/define-search.png" alt="Discover interface showing search of flight sample data for Last 7 days"  width="700">

## Adding data fields and viewing data details

The document table contains document data. Each row represents a single document, and each column contains a different document field representing metrics such as flight destination, average ticket price, and flight delay. You can add, delete, or modify data fields in a document table as needed to meet your data analysis requirements. 

To add or delete fields in a document table, follow these steps:

1. View the data fields listed under **Available fields** and select the plus icon ({::nomarkdown}<img src="{{site.url}}{{site.baseurl}}/images/icons/plus-icon.png" class="inline-icon" alt="plus icon"/>{:/}) to add the desired fields to the document table. The field will be automatically added to both **Selected fields** and the document table. For this example, choose the fields `Carrier`, `AvgTicketPrice`, and `Dest`.
2. To arrange or sort the columns, select **Sort fields** > **Pick fields to sort by** and then drag and drop the fields in the order you want them to be ordered.

You'll see a view similar to the one in the following image.

<img src="{{site.url}}{{site.baseurl}}/images/dashboards/add-data-fields.png" alt="Discover interface showing adding and sorting data fields"  width="700">

You can view individual or multiple fields in the document table. To gather information about the data in the document table, follow these steps: 

1. From the data table's left-side column, choose the inspect icon ({::nomarkdown}<img src="{{site.url}}{{site.baseurl}}/images/icons/inspect-icon.png" class="inline-icon" alt="inspect icon"/>{:/}) to open the **Document Details** window. Select the minimize icon ({::nomarkdown}<img src="{{site.url}}{{site.baseurl}}/images/icons/minimize-icon.png" class="inline-icon" alt="minimize icon"/>{:/}) to close the **Document Details** window.
2. Review the data details. You can switch between the **Table** and **JSON** tabs to view the data in your preferred format. 
3. Select **View surrounding documents** to view data for other log entries either preceding or following your current document or select **View single document** to view a particular log entry.

You'll see a view similar to the one in the following image.

<img src="{{site.url}}{{site.baseurl}}/images/dashboards/doc-details.png" alt="Document details interface"  width="700">

## Searching the data

You can use the search toolbar to enter a [DQL]({{site.url}}{{site.baseurl}}/dashboards/discover/dql/) or [query string]({{site.url}}{{site.baseurl}}/query-dsl/full-text/query-string/) query. The search toolbar is best for basic queries; for full query and filter capability, use [query domain-specific language (DSL)]({{site.url}}{{site.baseurl}}/query-dsl/index/) in the [Dev Tools console]({{site.url}}{{site.baseurl}}/dashboards/dev-tools/index-dev/).

For more information, see [Discover and Dashboard search toolbar]({{site.url}}{{site.baseurl}}/dashboards/index/#discover-and-dashboard-search-bar).

## Filtering the data

Filters allow you to narrow the results of a query by specifying certain criteria. You can filter by field, value, or range. The **Add filter** pop-up suggests the available fields and operators.

To filter your data, follow these steps:

1. Under the DQL search bar, choose **Add filter**.
2. Select the desired options from the **Field**, **Operator**, and **Value** dropdown lists. For example, select `Cancelled`, `is`, and `true`.
3. Choose **Save**.
4. To remove the filter, choose the cross icon ({::nomarkdown}<img src="{{site.url}}{{site.baseurl}}/images/icons/cross-icon.png" class="inline-icon" alt="cross icon"/>{:/}) next to the filter name.
5. Add more filters to further explore the data.  

## Saving a search

To save your search, including the query text, filters, and current data view, follow these steps:  

1. Select **Save** in the upper-right corner. 
2. Give the search a title, and then choose **Save**. 
3. Select **Open** to access the saved search. 

## Creating data visualizations through Discover

To create visualizations of the data findings using the **Discover** app, follow these steps:

1. Select the inspect icon ({::nomarkdown}<img src="{{site.url}}{{site.baseurl}}/images/icons/inspect-icon.png" class="inline-icon" alt="inspect icon"/>{:/}) next to the field you want to visualize. 

   You'll see a view similar to the following image.
   
   <img src="{{site.url}}{{site.baseurl}}/images/dashboards/visualize-discover.png" alt="Visualize data findings interface" width="700"/>

2. Select the **Visualize** button. The **Visualize** app opens and a visualization is displayed. Learn more about the **Visualize** app and data visualizations in [Building data visualizations]({{site.url}}{{site.baseurl}}/dashboards/visualize/viz-index/). 

   You'll see a view similar to the following image.

   <img src="{{site.url}}{{site.baseurl}}/images/dashboards/visualization-flight.png" alt="Data visualization of flight sample data field destination" width="700"/>

## Setting alerts

You can set alerts to notify you when your data changes beyond the thresholds you define. To learn more about using **Discover** to create and manage alerts, see [Alerting dashboards and visualizations]({{site.url}}{{site.baseurl}}/observing-your-data/alerting/dashboards-alerting/).