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Security Operations · Foundational

Splunk Index

A repository in Splunk where ingested data is stored and from which searches retrieve events.

Definition

Indexes store raw data in compressed journal files and time-series index files organized into buckets (hot, warm, cold, frozen, thawed). Separate indexes allow different retention and access controls. The default index is main, and internal logs go to _internal.

Example

index=firewall sourcetype=pan:traffic action=blocked

Exam tip

Specifying the index in searches improves performance; retention is configured per index.

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