Query Planning & Statistics (EXPLAIN ANALYZE) Quiz Home › PostgreSQL DBA › Query Planning & Statistics (EXPLAIN ANALYZE) 🔍 Postgres Database Administration – Query Planning & Statistics (EXPLAIN ANALYZE) 20 questions · 15 min timer · Explanations included · Free 1. What role does the 'random_page_cost' parameter play in query planning? It controls the frequency of autovacuum operations. It sets the maximum number of pages that can be read randomly. It determines the cost of sequential I/O operations. It influences the planner's preference for index scans over sequential scans. None Show Hint The 'random_page_cost' parameter influences the planner's decision to prefer index scans over sequential scans by setting the cost of random I/O operations. 2. Which of the following scenarios might lead to a sequential scan being chosen over an index scan? The query involves a complex join operation. The table is frequently updated. The table is very small, and a sequential scan is more efficient. The table has a large number of indexes. None Show Hint For very small tables, a sequential scan might be more efficient than an index scan due to the overhead of using the index. Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Loading questions... Click Submit to see your final score! Previous Start Quiz Next Time's up
