Junior — Middle
What is the purpose of using the EXPLAIN operator in a database?
sobes.tech AI
Answer from AI
The EXPLAIN operator in a database is used to analyze and understand how the DBMS executes an SQL query. It shows the execution plan of the query, including:
- Which indexes are used
- The order of table scans
- Cost estimates of operations
- The number of rows processed at each stage
This helps optimize queries, identify bottlenecks, and improve database performance. For example, if EXPLAIN shows a full table scan instead of using an index, an index can be added to speed up the query.