redshift drop or truncate table very very slow

Question

When drop or truncate a not too big table(4M rows) in my redshift database, it take very very long(hours) to complete. Does anybody experience the same issue?

Thanks

Answer 1

IMO AccessShareLock on tables also causes DDL commands to get stuck.

Run this query to figure out pids of AccessShareLock

select
  current_time,
  c.relname,
  l.database,
  l.transaction,
  l.pid,
  a.usename,
  l.mode,
  l.granted
from pg_locks l
join pg_catalog.pg_class c ON c.oid = l.relation
join pg_catalog.pg_stat_activity a ON a.procpid = l.pid
where l.pid <> pg_backend_pid();

Kill the processes using select pg_terminate_backend();

Ensure that all your read-only applications close and releases all connections and hence these locks!