Re: Create index concurrently hanging with big table on pgsql 9.3.12

Try the following query. See if it shows you if another transaction is blocking the needed locks to create the index.

SELECT
   w.query as waiting_query,
   w.pid as waiting_pid,
   w.usename as w_user,
   l.pid as blocking_pid,
   l.usename as blocking_user,
   t.schemaname || '.' || t.relname as tablename
   FROM pg_stat_activity w
   JOIN pg_locks l1 ON (w.pid = l1.pid and not l1.granted)
   JOIN pg_locks l2 on (l1.relation = l2.relation and l2.granted)
   JOIN pg_stat_activity l ON (l2.pid = l.pid)
   JOIN pg_stat_user_tables t ON (l1.relation = t.relid)
   WHERE w.waiting;