The Data Summary feature in Splunk Web provides a high-level, comprehensive overview of the indexed data. It is accessed with a single click from the Search & Reporting app and quickly presents three tabs: Hosts, Sources, and Sourcetypes. This allows a user to immediately see the different machines sending data, the files and streams the data originates from, and the formats of that data. This is the most direct and efficient method for discovering the landscape of data available for searching within a Splunk deployment.

A. Review Splunk reports: Reports are saved searches and only show data specific to their configuration; they do not provide a comprehensive overview of all available data.
B. Run ./splunk show: This is a command-line interface (CLI) command used by administrators to check the status of Splunk processes, not to summarize indexed data.
D. Search index= sourcetype= host=: This search is extremely inefficient and resource-intensive. It returns raw events rather than a summary, making it a poor choice for a "quick" overview.

1. Splunk Enterprise

Search Tutorial

Version 9.2.1

"Use the Data Summary to learn about the data" section.

"A quick way to learn about the data that you have access to is to use the Data Summary. The Data Summary dialog box gives you a quick overview of the hosts

sources

and sourcetypes in the data." This directly supports option C as the intended method.

2. Splunk Enterprise

Search Manual

Version 9.2.1

"Get started with Search" chapter

"Explore your data" section.

This section describes the Data Summary as a primary tool for data exploration: "From the Search page in the Search & Reporting App

you can browse a list of the hosts

sources

and sourcetypes from the events in a particular time range." This confirms its role as a comprehensive summary tool.

3. Splunk Enterprise

Admin Manual

Version 9.2.1

"The Splunk CLI" chapter

"Admin commands" section.

This manual details the usage of CLI commands like ./splunk show

confirming they are for administrative tasks such as checking server status

not for data exploration. This validates why option B is incorrect.