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Add vacuum health monitoring with c77_dbh_vacuum_stats and c77_dbh_get_vacuum_health

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This commit is contained in:
Tom Rogers 2025-03-24 13:07:19 -05:00
parent 8c5af23b78
commit 19b1de9935
3 changed files with 96 additions and 0 deletions
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15
c77_dbh_vacuum_stats_table.sql Normal file
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CREATE TABLE IF NOT EXISTS public.c77_dbh_vacuum_stats (
table_name text COLLATE pg_catalog."default" PRIMARY KEY, -- Fully qualified table name (schema.table)
last_vacuum timestamp without time zone, -- Last manual vacuum
last_autovacuum timestamp without time zone, -- Last autovacuum
vacuum_count bigint DEFAULT 0, -- Number of vacuums
dead_tuples bigint DEFAULT 0, -- Estimated dead tuples
live_tuples bigint DEFAULT 0, -- Estimated live tuples
table_size bigint DEFAULT 0, -- Table size in bytes
bloat_estimate numeric DEFAULT 0, -- Estimated bloat percentage
last_updated timestamp without time zone DEFAULT now() -- Last stats update
);
REVOKE ALL ON TABLE public.c77_dbh_vacuum_stats FROM PUBLIC;
GRANT SELECT ON TABLE public.c77_dbh_vacuum_stats TO PUBLIC;
GRANT ALL ON TABLE public.c77_dbh_vacuum_stats TO homestead; -- Adjust role as needed

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public.c77_dbh_get_vacuum_health.sql Normal file
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CREATE OR REPLACE FUNCTION public.c77_dbh_get_vacuum_health()
RETURNS JSON AS $$
BEGIN
RETURN (
SELECT json_agg(
json_build_object(
'metric', 'Table Vacuum Health',
'table_name', table_name,
'status', CASE
WHEN bloat_estimate > 50 THEN 'Red'
WHEN bloat_estimate > 20 THEN 'Yellow'
ELSE 'Green'
END,
'severity', CASE
WHEN bloat_estimate > 50 THEN 5
WHEN bloat_estimate > 20 THEN 3
ELSE 1
END,
'insight', CASE
WHEN bloat_estimate > 50 THEN 'Table has critical bloat; vacuum and analyze urgently.'
WHEN bloat_estimate > 20 THEN 'Table has moderate bloat; consider vacuuming.'
ELSE 'Table is in good health.'
END,
'action', CASE
WHEN bloat_estimate > 50 THEN 'Run VACUUM FULL or CLUSTER; check autovacuum settings.'
WHEN bloat_estimate > 20 THEN 'Run VACUUM and ANALYZE; monitor autovacuum.'
ELSE 'No action needed.'
END,
'last_vacuum', last_vacuum::text,
'last_autovacuum', last_autovacuum::text,
'vacuum_count', vacuum_count,
'dead_tuples', dead_tuples,
'live_tuples', live_tuples,
'table_size', table_size::text || ' bytes',
'bloat_estimate', bloat_estimate::text || '%'
)
)
FROM public.c77_dbh_vacuum_stats
);
END;
$$ LANGUAGE plpgsql;

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public.c77_dbh_update_vacuum_stats.sql Normal file
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CREATE OR REPLACE FUNCTION public.c77_dbh_update_vacuum_stats()
RETURNS void AS $$
BEGIN
-- Insert or update vacuum stats for all user tables
INSERT INTO public.c77_dbh_vacuum_stats (
table_name, last_vacuum, last_autovacuum, vacuum_count,
dead_tuples, live_tuples, table_size, last_updated
)
SELECT
(n.nspname || '.' || c.relname) AS table_name,
s.last_vacuum,
s.last_autovacuum,
COALESCE(s.vacuum_count, 0) + COALESCE(s.autovacuum_count, 0) AS vacuum_count,
s.n_dead_tup AS dead_tuples,
s.n_live_tup AS live_tuples,
pg_relation_size(c.oid) AS table_size,
now() AS last_updated
FROM pg_stat_all_tables s
JOIN pg_class c ON c.oid = s.relid
JOIN pg_namespace n ON n.oid = c.relnamespace
WHERE n.nspname NOT IN ('pg_catalog', 'information_schema')
ON CONFLICT (table_name) DO UPDATE
SET
last_vacuum = EXCLUDED.last_vacuum,
last_autovacuum = EXCLUDED.last_autovacuum,
vacuum_count = EXCLUDED.vacuum_count,
dead_tuples = EXCLUDED.dead_tuples,
live_tuples = EXCLUDED.live_tuples,
table_size = EXCLUDED.table_size,
last_updated = EXCLUDED.last_updated;
-- Estimate bloat (simple heuristic for now; requires pgstattuple for precision)
UPDATE public.c77_dbh_vacuum_stats
SET bloat_estimate = CASE
WHEN live_tuples + dead_tuples = 0 THEN 0
ELSE ROUND((dead_tuples::numeric / (live_tuples + dead_tuples)) * 100, 2)
END
WHERE last_updated = now();
END;
$$ LANGUAGE plpgsql;