>How to monitor the Hits on database and how many hits on each user tables
> Through query.
Do these help? You can run them through a cron job.
SELECT pg_stat_database.datname,
pg_stat_database.blks_read,
pg_stat_database.blks_hit,
round((pg_stat_database.blks_hit::double precision
/ (pg_stat_database.blks_read
+ pg_stat_database.blks_hit
+1)::double precision * 100::double precision)::numeric, 2) AS cachehitratio
FROM pg_stat_database
WHERE pg_stat_database.datname !~ '^(template(0|1)|postgres)$'::text
ORDER BY round((pg_stat_database.blks_hit::double precision
/ (pg_stat_database.blks_read
+ pg_stat_database.blks_hit
+ 1)::double precision * 100::double precision)::numeric, 2) DESC;
-- For all tables in a specific database (you need to iterate through all db's)
SELECT n.nspname,
s.relname,
c.reltuples::bigint,
c.relfrozenxid,
age(c.relfrozenxid) AS age_frozenxid,
n_live_tup,
n_tup_ins,
n_tup_upd,
n_tup_del,
date_trunc('second', last_vacuum) as last_vacuum,
date_trunc('second', last_autovacuum) as last_autovacuum,
date_trunc('second', last_analyze) as last_analyze,
date_trunc('second', last_autoanalyze) as last_autoanalyze ,
round( current_setting('autovacuum_vacuum_threshold')::integer + current_setting('autovacuum_vacuum_scale_factor')::numeric * C.reltuples) AS av_threshold
,CASE WHEN reltuples > 0
THEN round(100.0 * n_dead_tup / (reltuples))
ELSE 0
END AS pct_dead,
CASE WHEN n_dead_tup > round( current_setting('autovacuum_vacuum_threshold')::integer + current_setting('autovacuum_vacuum_scale_factor')::numeric * C.reltuples)
THEN 'VACUUM'
ELSE 'ok'
END AS "av_needed"
FROM pg_stat_all_tables s
JOIN pg_class c ON c.oid = s.relid
JOIN pg_namespace n ON (n.oid = c.relnamespace)
WHERE s.relname NOT LIKE 'pg_%'
AND s.relname NOT LIKE 'sql_%'
ORDER by 1, 2;
