Quick Answer
pg_stat_statements extension tracks execution statistics for every SQL query: total execution time, number of calls, rows returned, buffer hits/misses. Query: SELECT query, calls, total_exec_time, mean_exec_time FROM pg_stat_statements ORDER BY total_exec_time DESC. Essential for finding which queries are consuming the most database time. Reset with pg_stat_statements_reset().
Answer
pg_stat_statements collects query execution statistics like total time and frequency, useful for performance tuning.
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Verified Answer
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