Redhift UI 通常只显示长时间运行的查询。我遇到了类似的问题,它们是由某些表上的锁定引起的——在我们的例子中,是由未提交的显式事务(BEGIN
没有COMMIT
or ROLLBACK
)引起的。
运行此查询以查看当前事务及其锁:
select a.txn_owner, a.txn_db, a.xid, a.pid, a.txn_start, a.lock_mode, a.relation as table_id,nvl(trim(c."name"),d.relname) as tablename, a.granted,b.pid as blocking_pid ,datediff(s,a.txn_start,getdate())/86400||' days '||datediff(s,a.txn_start,getdate())%86400/3600||' hrs '||datediff(s,a.txn_start,getdate())%3600/60||' mins '||datediff(s,a.txn_start,getdate())%60||' secs' as txn_duration
from svv_transactions a
left join (select pid,relation,granted from pg_locks group by 1,2,3) b
on a.relation=b.relation and a.granted='f' and b.granted='t'
left join (select * from stv_tbl_perm where slice=0) c
on a.relation=c.id
left join pg_class d on a.relation=d.oid
where a.relation is not null;
阅读 AWS 知识库条目了解更多详情https://aws.amazon.com/premiumsupport/knowledge-center/prevent-locks-blocking-queries-redshift/