pg_stat_statements in PostgreSQL?pg_stat_statements is an extension that tracks execution statistics of all SQL statements executed by a server. It helps identify slow or expensive queries.
pg_stat_statements in PostgreSQL?To enable, add pg_stat_statements to shared_preload_libraries in postgresql.conf and restart the server. Then run CREATE EXTENSION pg_stat_statements; in your database.
pg_stat_statements?You query the pg_stat_statements view. It shows aggregated stats like total time, calls, and average time per query.
pg_stat_statements?SELECT query, calls, total_time, mean_time FROM pg_stat_statements ORDER BY mean_time DESC LIMIT 5;
mean_time instead of total_time when analyzing slow queries?mean_time shows the average time per execution, helping identify queries that are slow individually, even if they run fewer times. total_time can be high for frequently run fast queries.
pg_stat_statements in PostgreSQL?You must add pg_stat_statements to shared_preload_libraries in the config file and restart PostgreSQL before creating the extension.
pg_stat_statements shows the average execution time of a query?mean_time is the average time taken per execution of the query.
pg_stat_statements?Ordering by mean_time descending shows queries with the highest average execution time first.
calls column represent in pg_stat_statements?calls counts how many times the query has run.
total_time not be slow individually?A high total_time can come from many fast executions, so average time per call (mean_time) is better to find slow queries.
pg_stat_statements to find slow queries in PostgreSQL.mean_time is more useful than total_time when analyzing slow queries with pg_stat_statements.