Re: overhead of "small" large objects

> > Is there significant overhead involoved in using large objects that
> > aren't very large?
>
> Yes, since each large object is a separate table in 7.0.* and before.
> The allocation unit for table space is 8K, so your 10K objects chew up
> 16K of table space.  What's worse, each LO table has a btree index, and
> the minimum size of a btree index is 16K --- so your objects take 32K
> apiece.
>
> That accounts for a factor of 3.  I'm not sure where the other 8K went.
> Each LO table will require entries in pg_class, pg_attribute, pg_type,
> and pg_index, plus the indexes on those tables, but that doesn't seem
> like it'd amount to anything close to 8K per LO.
>
> 7.1 avoids this problem by keeping all LOs in one big table.

Or you can use my patch for the same functionality in 7.0.x.
You can get it at: http://www.perchine.com/dyp/pg/

--
Sincerely Yours,
Denis Perchine

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