Simple explanation
Not every search needs to work the same way — Splunk offers different modes trading speed for detail, and every search you run becomes a trackable "job" with its own lifecycle.
Technical explanation
- Fast mode — prioritizes speed, minimizes field discovery, may not display all available fields (optimized for rapid searching over large data).
- Smart mode (the default) — behaves like Fast mode for raw event searches but like Verbose mode when a transforming command is used, adapting automatically based on what the search actually needs.
- Verbose mode — discovers and displays all available fields, most thorough but slowest, useful when you're actively exploring unfamiliar data.
- Search job lifecycle: every executed search becomes a job with a default lifetime of 10 minutes before being automatically discarded — this can be extended (up to a maximum, commonly 7 days) via Job Settings if you need to return to results later.
- Job status/controls: a running job can be paused or stopped at any point; the Activity/Jobs menu shows currently running and recently completed jobs, letting you revisit a job's results as they existed when it actually ran, not live-refreshed data.
- Search Assistant — enabled by default in the SPL editor, offering autocomplete and inline syntax help, including highlighting matching parentheses.
Synonyms / related terms
| Term | Means | |---|---| | Job lifetime | How long search job results are retained before automatic deletion | | Search Assistant | The inline autocomplete/syntax-help feature in the search bar |
Concept Check
"An analyst wants to quickly scan a huge volume of raw events for a general pattern, without needing every possible field discovered and displayed." Fast mode is the appropriate choice here, not Verbose — Verbose mode's thorough field discovery adds overhead that isn't needed for this use case, where speed over a large raw dataset matters more than complete field visibility.
Interview-style Q&A
Q: Why does Smart mode behave differently depending on whether a transforming command is present? A: "Smart mode is designed to give you the right trade-off automatically rather than making you choose manually every time. If you're just looking at raw events, there's no need for expensive full field discovery — Fast-like behavior is fine. But once you pipe into a transforming command like stats or chart, the fields involved actually matter for the calculation, so Smart mode shifts to Verbose-like thoroughness specifically to support that need."
Memory trick
"Fast is Quick, Smart Adapts, Verbose is Thorough" — three modes, each tagged to its one-word defining trade-off.