Re: jsonb format is pessimal for toast compression

On 08/14/2014 11:13 AM, Bruce Momjian wrote:
> On Thu, Aug 14, 2014 at 01:57:14PM -0400, Tom Lane wrote:
>> Maybe this is telling us it's not worth changing the representation,
>> and we should just go do something about the first_success_by threshold
>> and be done.  I'm hesitant to draw such conclusions on the basis of a
>> single use-case though, especially one that doesn't really have that
>> much use for compression in the first place.  Do we have other JSON
>> corpuses to look at?
> 
> Yes, that is what I was expecting --- once the whitespace and syntax
> sugar is gone in JSONB, I was unclear how much compression would help.

I thought the destruction case was when we have enough top-level keys
that the offsets are more than 1K total, though, yes?

So we need to test that set ...

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com