Generally helpful Queries
Postgres Scripts
Database Service Uptime
select current_timestamp - pg_postmaster_start_time() as uptime;
Object Owner by user
select
nsp.nspname as SchemaName
,cls.relname as ObjectName
,rol.rolname as ObjectOwner
,case cls.relkind
when 'r' then 'TABLE'
when 'm' then 'MATERIALIZED_VIEW'
when 'i' then 'INDEX'
when 'S' then 'SEQUENCE'
when 'v' then 'VIEW'
when 'c' then 'TYPE'
else cls.relkind::text
end as ObjectType
from pg_class cls
join pg_roles rol
on rol.oid = cls.relowner
join pg_namespace nsp
on nsp.oid = cls.relnamespace
where nsp.nspname not in ('information_schema', 'pg_catalog')
and nsp.nspname not like 'pg_toast%'
and rol.rolname = 'postgres'
union
select nspname, proname, rolname, objecttype from (select
nsp.nspname ,
proname,
rol.rolname ,
'PROCEDURE' as ObjectType
from
pg_proc
join pg_roles rol
on pg_proc.oid = pg_proc.oid
join pg_namespace nsp
on nsp.oid = pg_proc.pronamespace
where nsp.nspname not in ('information_schema', 'pg_catalog','extension_data')
and nsp.nspname not like 'pg_toast%'
and rol.rolname = '<user name>'
group by
1,2,3) as procs
order by 4,1,2,3;
Table metrics
SELECT l.metric, l.nr AS bytes
, CASE WHEN is_size THEN pg_size_pretty(nr) END AS bytes_pretty
, CASE WHEN is_size THEN nr / NULLIF(x.ct, 0) END AS bytes_per_row
FROM (
SELECT min(tableoid) AS tbl -- = 'public.tbl'::regclass::oid
, count(*) AS ct
, sum(length(t::text)) AS txt_len -- length in characters
FROM <schema.table> t -- provide table name *once*
) x
CROSS JOIN LATERAL (
VALUES
(true , 'core_relation_size' , pg_relation_size(tbl))
, (true , 'visibility_map' , pg_relation_size(tbl, 'vm'))
, (true , 'free_space_map' , pg_relation_size(tbl, 'fsm'))
, (true , 'table_size_incl_toast' , pg_table_size(tbl))
, (true , 'indexes_size' , pg_indexes_size(tbl))
, (true , 'total_size_incl_toast_and_indexes', pg_total_relation_size(tbl))
, (true , 'live_rows_in_text_representation' , txt_len)
, (false, '------------------------------' , NULL)
, (false, 'row_count' , ct)
, (false, 'live_tuples' , pg_stat_get_live_tuples(tbl))
, (false, 'dead_tuples' , pg_stat_get_dead_tuples(tbl))
) l(is_size, metric, nr);