Query Plan
Definition
A query plan describes the concrete steps of a database query.
The concrete sequence of operators with which a database system executes a query.
Simply explained
Like a work plan, it specifies when data is read, joined, and sorted.
Why it matters in practice
The term improves reliable access to data and knowledge as well as their usable linkage in digital systems.
Example from business
EXPLAIN shows scan, join, sort, and estimated costs of an SQL query.
Limits and pitfalls
- Confusing estimated and actual plans or considering only total costs.
Origin & history
Query plans became the central diagnostic tool for database performance with relational optimizers.
Use in mid-sized companies
- Possible application: EXPLAIN shows scan, join, sort, and estimated costs of an SQL query.
Frequently asked questions
What does query plan mean?
The concrete sequence of operators with which a database system executes a query. What mistakes should be avoided? Confusing estimated and actual plans or considering only total costs.
Sources
Source checked on 10.10.2026. Editorial application examples are hypothetical; no evidence of real customer results.
Editorially reviewed on: