Блокировки

-- запросы онлайн
SELECT * FROM pg_stat_activity order by client_addr;

-- блокировки по пидам
SELECT locktype, relation::regclass, mode, transactionid AS tid,
virtualtransaction AS vtid, pid, granted
FROM pg_catalog.pg_locks l LEFT JOIN pg_catalog.pg_database db
ON db.oid = l.database WHERE (db.datname = 'sandbox' OR db.datname IS NULL)
AND NOT pid = pg_backend_pid()

--3
SELECT locktype, relation::regclass,mode, transactionid AS tid,
virtualtransaction AS vtid,pid, granted
FROM pg_catalog.pg_locks l LEFT JOIN pg_catalog.pg_database db
ON db.oid=l.database WHERE (db.datname='cabinet' OR db.datname IS NULL)
AND NOT pid = pg_backend_pid();



SELECT bl.pid     AS blocked_pid,
     a.usename  AS blocked_user,
     kl.pid     AS blocking_pid,
     ka.usename AS blocking_user,
     a.query    AS blocked_statement
FROM  pg_catalog.pg_locks         bl
 JOIN pg_catalog.pg_stat_activity a  ON a.pid = bl.pid
 JOIN pg_catalog.pg_locks         kl ON kl.transactionid = bl.transactionid AND kl.pid != bl.pid
 JOIN pg_catalog.pg_stat_activity ka ON ka.pid = kl.pid
WHERE NOT bl.granted

select pid,
       usename,
       pg_blocking_pids(pid) as blocked_by,
       query as blocked_query
from pg_stat_activity
where cardinality(pg_blocking_pids(pid)) > 0

SELECT
  COALESCE(blockingl.relation::regclass::text,blockingl.locktype) as locked_item,
  now() - blockeda.query_start AS waiting_duration, blockeda.pid AS blocked_pid,
  blockeda.query as blocked_query, blockedl.mode as blocked_mode,
  blockinga.pid AS blocking_pid, blockinga.query as blocking_query,
  blockingl.mode as blocking_mode
FROM pg_catalog.pg_locks blockedl
JOIN pg_stat_activity blockeda ON blockedl.pid = blockeda.pid
JOIN pg_catalog.pg_locks blockingl ON(
  ( (blockingl.transactionid=blockedl.transactionid) OR
  (blockingl.relation=blockedl.relation AND blockingl.locktype=blockedl.locktype)
  ) AND blockedl.pid != blockingl.pid)
JOIN pg_stat_activity blockinga ON blockingl.pid = blockinga.pid
  AND blockinga.datid = blockeda.datid
WHERE NOT blockedl.granted
AND blockinga.datname = current_database()

select t.relname,l.locktype,page,virtualtransaction,pid,mode,granted from pg_locks l, pg_stat_all_tables t where l.relation=t.relid order by relation asc;

SELECT blockeda.pid AS blocked_pid, blockeda.query as blocked_query,
  blockinga.pid AS blocking_pid, blockinga.query as blocking_query
FROM pg_catalog.pg_locks blockedl
JOIN pg_stat_activity blockeda ON blockedl.pid = blockeda.pid
JOIN pg_catalog.pg_locks blockingl ON(blockingl.transactionid=blockedl.transactionid
  AND blockedl.pid != blockingl.pid)
JOIN pg_stat_activity blockinga ON blockingl.pid = blockinga.pid
WHERE NOT blockedl.granted AND blockinga.datname='cabinet';

Размер таблиц в postgres

см. прочие поля в таблице.

SELECT oid,
       table_schema,
       table_name,
       total_bytes,
       pg_size_pretty(total_bytes) AS humna_size
  FROM (
  SELECT *, total_bytes-index_bytes-COALESCE(toast_bytes,0) AS table_bytes FROM (
      SELECT c.oid,nspname AS table_schema, relname AS TABLE_NAME
              , c.reltuples AS row_estimate
              , pg_total_relation_size(c.oid) AS total_bytes
              , pg_indexes_size(c.oid) AS index_bytes
              , pg_total_relation_size(reltoastrelid) AS toast_bytes
          FROM pg_class c
          LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
          WHERE relkind = 'r'
  ) a
) a
-- where round(total_bytes/1024/1024) > 100 -- только если размер больше 100Мб
order by total_bytes desc