Every now and then I’ll run the queries below to help me figure out ways to optimize the queries my application is using, and to figure out if certain tables and views (relations) need to be optimized.

Updated January 18, 2020, to add a query to alter the autovacuum and autoanalyze factors on a per table basis because I have a “cache” table that is updated quite frequently and generates many dead tuples every minute. The table would balloon from 250 MB to 15 GB in a few hours. I hope that reducing these factors to just a threshold of 100 dead tuples will prevent the inflation. I also need to monitor this that it doesn’t make my RDS database work too hard.

/* Show the last time at which every table and view was vacuumed and analyzed */
SELECT relname, last_vacuum, last_autovacuum, last_analyze, last_autoanalyze  
FROM pg_stat_all_tables  d_d
WHERE schemaname = 'public';  

/* See which queries are most popular */
SELECT * FROM pg_stat_statements where calls >=1000; /* replace 1000 with any integer, depending on how active your database is queried */
select pg_stat_statements_reset();

/* Kill a specific query */
select pg_terminate_backend(INTEGER); /* replace INTEGER with the process ID of a specific query */

/* Get the size of the database */
select pg_size_pretty(pg_database_size('DATABASE_NAME')); /* replace DATABASE_NAME with the name of your database */

/* Kill queries that are taking too long; replace DATABASE_NAME with the name of your database */
SELECT query, pg_terminate_backend(pid) 
    FROM pg_stat_activity 
    WHERE datname = 'DATABASE_NAME' 
      AND pid <> pg_backend_pid() 
      AND (state = 'active' 
      OR state = 'idle') 
      AND state_change < current_timestamp - INTERVAL '15' MINUTE; /* change 15 to any integer that you think means a query is taking too long */

/* See which queries are running */
select * from pg_stat_activity;
SELECT * FROM pg_stat_activity WHERE wait_event IS NOT NULL AND backend_type = 'client backend';

/* Find very large indexes and indexes that aren't used much */
WITH table_scans as ( 
    SELECT relid, 
        tables.idx_scan + tables.seq_scan as all_scans, 
        ( tables.n_tup_ins + tables.n_tup_upd + tables.n_tup_del ) as writes, 
                pg_relation_size(relid) as table_size 
        FROM pg_stat_user_tables as tables 
all_writes as ( 
    SELECT sum(writes) as total_writes 
    FROM table_scans 
indexes as ( 
    SELECT idx_stat.relid, idx_stat.indexrelid, 
        idx_stat.schemaname, idx_stat.relname as tablename, 
        idx_stat.indexrelname as indexname, 
        pg_relation_size(idx_stat.indexrelid) as index_bytes, 
        indexdef ~* 'USING btree' AS idx_is_btree 
    FROM pg_stat_user_indexes as idx_stat 
        JOIN pg_index 
            USING (indexrelid) 
        JOIN pg_indexes as indexes 
            ON idx_stat.schemaname = indexes.schemaname 
                AND idx_stat.relname = indexes.tablename 
                AND idx_stat.indexrelname = indexes.indexname 
    WHERE pg_index.indisunique = FALSE 
index_ratios AS ( 
SELECT schemaname, tablename, indexname, 
    idx_scan, all_scans,
    round(( CASE WHEN all_scans = 0 THEN 0.0::NUMERIC 
        ELSE idx_scan::NUMERIC/all_scans * 100 END),2) as index_scan_pct, 
    round((CASE WHEN writes = 0 THEN idx_scan::NUMERIC ELSE idx_scan::NUMERIC/writes END),2) 
        as scans_per_write, 
    pg_size_pretty(index_bytes) as index_size, 
    pg_size_pretty(table_size) as table_size, 
    idx_is_btree, index_bytes
    FROM indexes 
    JOIN table_scans 
    USING (relid) 
index_groups AS ( 
SELECT 'Never Used Indexes' as reason, *, 1 as grp 
FROM index_ratios 
    idx_scan = 0
    and idx_is_btree 
SELECT 'Low Scans, High Writes' as reason, *, 2 as grp 
FROM index_ratios 
    scans_per_write <= 1
    and index_scan_pct < 10 
    and idx_scan > 0 
    and writes > 100 
    and idx_is_btree 
SELECT 'Seldom Used Large Indexes' as reason, *, 3 as grp 
FROM index_ratios 
    index_scan_pct < 5
    and scans_per_write > 1 
    and idx_scan > 0 
    and idx_is_btree 
    and index_bytes > 100000000 
SELECT 'High-Write Large Non-Btree' as reason, index_ratios.*, 4 as grp 
FROM index_ratios, all_writes 
    ( writes::NUMERIC / ( total_writes + 1 ) ) > 0.02 
    AND NOT idx_is_btree 
    AND index_bytes > 100000000 
ORDER BY grp, index_bytes DESC ) 
SELECT reason, schemaname, tablename, indexname, 
    index_scan_pct, scans_per_write, index_size, table_size
FROM index_groups; 

/* Modify the autovacuum and autoanalyze factors for a single table 
https://klotzandrew.com/blog/posgres-per-table-autovacuum-management */
ALTER TABLE cache SET (autovacuum_analyze_scale_factor = 0, autovacuum_analyze_threshold = 100);

WITH raw_data AS (
    pg_class.oid AS relid,
    (SELECT split_part(x, '=', 2) FROM unnest(pg_class.reloptions) q (x) WHERE x ~ '^autovacuum_analyze_scale_factor=' ) as c_analyze_factor,
    (SELECT split_part(x, '=', 2) FROM unnest(pg_class.reloptions) q (x) WHERE x ~ '^autovacuum_analyze_threshold=' ) as c_analyze_threshold,
    (SELECT split_part(x, '=', 2) FROM unnest(pg_class.reloptions) q (x) WHERE x ~ '^autovacuum_vacuum_scale_factor=' ) as c_vacuum_factor,
    (SELECT split_part(x, '=', 2) FROM unnest(pg_class.reloptions) q (x) WHERE x ~ '^autovacuum_vacuum_threshold=' ) as c_vacuum_threshold,
    to_char(pg_stat_all_tables.last_vacuum, 'YYYY-MM-DD HH24:MI:SS') as last_vacuum,
    to_char(pg_stat_all_tables.last_autovacuum, 'YYYY-MM-DD HH24:MI:SS') as last_autovacuum
  JOIN pg_namespace ON pg_class.relnamespace = pg_namespace.oid
    LEFT OUTER JOIN pg_stat_all_tables ON pg_class.oid = pg_stat_all_tables.relid
    n_dead_tup IS NOT NULL
    AND nspname NOT IN ('information_schema', 'pg_catalog')
    AND nspname NOT LIKE 'pg_toast%'
    AND pg_class.relkind = 'r'
), data AS (
    COALESCE(raw_data.c_analyze_factor, current_setting('autovacuum_analyze_scale_factor'))::float8 AS analyze_factor,
    COALESCE(raw_data.c_analyze_threshold, current_setting('autovacuum_analyze_threshold'))::float8 AS analyze_threshold,
    COALESCE(raw_data.c_vacuum_factor, current_setting('autovacuum_vacuum_scale_factor'))::float8 AS vacuum_factor,
    COALESCE(raw_data.c_vacuum_threshold, current_setting('autovacuum_vacuum_threshold'))::float8 AS vacuum_threshold
  FROM raw_data
  ROUND(reltuples * vacuum_factor + vacuum_threshold) AS v_threshold,
  ROUND(reltuples * analyze_factor + analyze_threshold) AS a_threshold,
  c_analyze_factor as caf,
  c_analyze_threshold as cat,
  c_vacuum_factor as cvf,
  c_vacuum_threshold as cvt,
  analyze_factor as af,
  analyze_threshold as at,
  vacuum_factor as vf,
  vacuum_threshold as vt,
ORDER BY n_dead_tup DESC;