Обсуждение: Using Large Object in PostgreSQL
I just used oid as a reference to store some binary large object.
After some time, I find that the data build up to a very large size 3.xx GB but I just have 2 or 3 records with a binary large object inside. So what may be the problem?
by the way, I just delete the records with oid field using delete from table where id = 'xxx'. Will this left a unreferenced copy of large object inside the database? If yes, what should I do?
Thx in advance.
"Simon Shum" <s035668@mailserv.cuhk.edu.hk> writes:
> I just used oid as a reference to store some binary large object.
> After some time, I find that the data build up to a very large size 3.xx GB=
> but I just have 2 or 3 records with a binary large object inside. So what=
> may be the problem?
> by the way, I just delete the records with oid field using delete from tabl=
> e where id =3D 'xxx'. Will this left a unreferenced copy of large object in=
> side the database?
Yes.
> If yes, what should I do?
contrib/vacuumlo will help you identify the large objects that need to
be removed. After you get done, pg_largeobject will need a VACUUM
FULL.
See also contrib/lo, which is a wrapper datatype that deletes large
objects when you delete the reference. This is probably closer to the
behavior you were expecting.
regards, tom lane