Have you had experience analyzing or reviewing SQL query execution plans?

Yes, I have experience analyzing SQL query execution plans. The execution plan shows how the DBMS intends to execute the query: which indexes to use, the order of table joins, data access methods (e.g., sequential scan or index search). This helps optimize queries, identify bottlenecks, and improve performance.

Example: in PostgreSQL, you can obtain a plan using the command:

EXPLAIN ANALYZE SELECT * FROM users WHERE age > 30;

As a result, you will see a tree of operations with estimated costs and execution times, which helps understand which parts of the query need optimization.