-- CHECK CACHE RATE --
SELECT
sum(heap_blks_read) as heap_read,
sum(heap_blks_hit) as heap_hit,
sum(heap_blks_hit) / (sum(heap_blks_hit) + sum(heap_blks_read)) as ratio
FROM
pg_statio_user_tables;
-- CHECK INDEX USAGE ---
SELECT
relname,
100 * idx_scan / (seq_scan + idx_scan) percent_of_times_index_used,
n_live_tup rows_in_table
FROM
pg_stat_user_tables
WHERE
seq_scan + idx_scan > 0
ORDER BY
n_live_tup DESC;
-- CHECK INDEX IN CACHE --
SELECT
sum(idx_blks_read) as idx_read,
sum(idx_blks_hit) as idx_hit,
(sum(idx_blks_hit) - sum(idx_blks_read)) / sum(idx_blks_hit) as ratio
FROM
pg_statio_user_indexes;
--QUERY TIME --
SELECT
(total_time / 1000 / 60) as total_minutes,
(total_time/calls) as average_time,
query
FROM pg_stat_statements
ORDER BY 1 DESC
LIMIT 100;