Splunk® Enterprise

Managing Indexers and Clusters of Indexers

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About managing indexes

When you add data, the indexer processes it and stores it in an index. By default, data you feed to an indexer is stored in the main index, but you can create and specify other indexes for different data inputs.

An index is a collection of directories and files. These are located under $SPLUNK_HOME/var/lib/splunk. Index directories are also called buckets and are organized by age. For information on index storage, see How Splunk Enterprise stores indexes.

In addition to the main index, Splunk Enterprise comes preconfigured with a number of internal indexes. Internal indexes are named starting with an underscore (_). To see a full list of indexes in Splunk Web, select the Settings link in the upper portion of Splunk Web and then select Indexes. The list includes:

  • main: The default Splunk Enterprise index. All processed external data is stored here unless otherwise specified.
  • _audit: Events from the file system change monitor, auditing, and all user search history.
  • _configtracker: This index contains data about changes to the Splunk Enterprise configuration files.
  • _internal: This index includes Splunk Enterprise internal logs.
  • _introspection: This index provides data about the Splunk Enterprise instance and environment.
  • _metrics: This index contains Splunk Enterprise internal data, stored in the form of metric data points.
  • _metrics_rollup: This index is used by the Monitoring Console when the Monitoring Console is enabled and the metrics rollup policy configured in the context of the Monitoring Console app is also enabled.
  • _telemetry: This index contains instrumentation data if the collection of such information is enabled.

A number of topics in this manual describe ways you can manage your indexes. In particular, the following topics are helpful in index management:

Index types

Splunk Enterprise supports two types of indexes:

  • Events indexes. Events indexes impose minimal structure and can accommodate any type of data, including metrics data. Events indexes are the default index type.
  • Metrics indexes. Metrics indexes use a highly structured format to handle the higher volume and lower latency demands associated with metrics data. Putting metrics data into metrics indexes results in faster performance and less use of index storage, compared to putting the same data into events indexes. For information on the metrics format, see the Metrics manual.

There are minimal differences in how indexers handle the two index types. Any differences that do exist are described in the relevant topic.

For more information about the indexing process

To learn more about indexes, see:

Last modified on 15 September, 2022
Indexers in a distributed deployment
Create custom indexes

This documentation applies to the following versions of Splunk® Enterprise: 9.0.0, 9.0.1, 9.0.2, 9.0.3, 9.0.4, 9.0.5, 9.0.6, 9.0.7, 9.0.8, 9.0.9, 9.1.0, 9.1.1, 9.1.2, 9.1.3, 9.1.4, 9.2.0, 9.2.1

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