What is kql example
Last updated: April 1, 2026
Key Facts
- Simple field-value examples like status:200 or method:GET find exact matches in specific fields
- Wildcard patterns using asterisk (*) match variable text, such as host:prod* for all production servers
- Boolean operators (AND, OR, NOT) combine multiple conditions for complex filtering
- Range queries use comparison operators: response_time > 500 or timestamp < 2024-01-01
- Quoted strings handle multi-word values: error_message:"connection timeout" or user:"John Smith"
Understanding KQL Examples
KQL examples showcase the language's straightforward syntax for filtering data in Kibana. Each example demonstrates a different query pattern, from simple to complex, helping users understand how to construct queries for their specific needs.
Basic Field-Value Examples
The simplest KQL queries match specific values in named fields:
- status:200 - finds all HTTP responses with status 200
- method:GET - filters requests using the GET method
- host:server1 - shows data only from server1
- level:error - displays all error-level log entries
Wildcard Pattern Examples
Wildcards extend queries to match multiple similar values. The asterisk (*) acts as a wildcard:
- host:prod* - matches prod1, prod2, production, etc.
- service:api-* - matches api-users, api-orders, api-payments
- filename:*.log - finds all log files regardless of name
Boolean Operator Examples
AND requires all conditions: status:error AND environment:production finds production errors only. OR accepts either condition: status:500 OR status:503 finds server errors. NOT excludes conditions: status:200 NOT method:HEAD finds successful responses excluding HEAD requests.
Range and Comparison Examples
Compare numeric and date values using >, <, >=, and <= operators:
- response_time > 1000 - queries slower than 1 second
- cpu_usage >= 85 - high CPU utilization
- timestamp > 2024-01-01 - data after January 1st, 2024
Complex Query Combinations
Combine patterns for sophisticated filtering: status:error AND (service:api OR service:web) AND timestamp > 2024-01-01 finds recent errors in API or web services. Parentheses group OR conditions while AND operations bind tighter.
Related Questions
How do I search for multiple conditions in Kibana KQL?
Use AND to require all conditions, OR to accept any condition, and parentheses to group operations. For example: (status:400 OR status:401) AND service:auth applies authentication status filtering to the auth service.
What are KQL wildcards and how do I use them?
Wildcards use the asterisk (*) symbol to match any characters. Examples include service:api* to match api-v1, api-v2, or api-beta, allowing flexible pattern-based searching.
Can I use the NOT operator in KQL queries?
Yes, the NOT operator excludes matching values. For instance, status:200 NOT method:HEAD finds successful responses except HEAD requests, useful for filtering out specific cases.
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Sources
- Elastic - Kibana Query Language Documentation Elastic License
- Elastic Blog - KQL Fundamentals Elastic License