Quickly look at pg_stat_statements

pg_stat_statements.sql

-- based on https://www.crunchydata.com/blog/understanding-postgres-iops

SELECT
    interval '1 millisecond' * total_exec_time AS "Total Exec. Time",
    to_char (
        (total_exec_time / sum(total_exec_time) OVER ()) * 100,
        'FM90D0'
    ) || '%' AS "Proportional Exec. Time",
    to_char (calls, 'FM999G999G999G990') AS "Calls",
    interval '1 millisecond' * (blk_read_time + blk_write_time) AS "Time Spent on IO",
    CASE
        WHEN length (query) <= 41 THEN query
        ELSE regexp_replace (query, '^(.{20}).*(.{20})$', '\1 {...} \2')
    END AS "Query",
    queryid AS "Query ID"
FROM
    pg_stat_statements
ORDER BY
    4 DESC
LIMIT
    10;