下载表后Redshift回收磁盘空间

Question

删除表后，redshift回收空闲磁盘空间还是需要运行真空。

Answer 1

drop table释放空间。

如果你正在做删除操作的表的行，那么你应该开火vaccumm删除唯一的命令。

无需火真空中删除表的情况下，红移以下命令

火灾前，表后下降，检查数据库的大小，看是否上涨空间

select sum(mbytes)/1024 as db_size_in_gb, database from (
select trim(pgdb.datname) as Database, 
trim(a.name) as Table, b.mbytes 
from stv_tbl_perm a 
join pg_database as pgdb on pgdb.oid = a.db_id 
join (select tbl, count(*) as mbytes 
from stv_blocklist group by tbl) b on a.id=b.tbl 
where a.slice=0 
order by db_id, name) 
group by database;