What is SPL (Search Processing Language)? [Intermediate]
Answer
SPL, or Search Processing Language, is Splunk's query language for searching, filtering, transforming, correlating, and visualizing events. It uses a pipeline model where each command processes results from the previous stage.
Technical explanation
SPL starts by selecting indexed data, usually with index, sourcetype, host, and time constraints.
Transforming commands such as stats, chart, timechart, and top summarize events into tables or charts.
eval, rex, fields, where, lookup, transaction, and join add analysis and enrichment, but performance depends heavily on filtering early.
Hands-on example
Example SPL: index=prod_app sourcetype=checkout_json earliest=-15m level=ERROR | stats count by service error_code | sort - count. This quickly answers which service and error code dominate recent failures.
Check how well your resume matches the role with our free resume checker— match score, ATS check, and the skills you're missing.
More Observability interview questions
- What is observability, and how is it different from traditional monitoring? [Basic]
- What are the three pillars of observability (metrics, logs, traces)? [Basic]
- What is the difference between monitoring and observability in practice? [Basic]
- What are the four golden signals of monitoring? [Basic]
- What is the difference between the USE method and the RED method? [Basic]
- When would you use the USE method versus the RED method? [Basic]
- What is an SLI, an SLO, and an SLA, and how do they relate? [Basic]
- How do you choose good SLIs for a service? [Basic]