| From: | Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> |
|---|---|
| To: | Sean Flaherty <sflaherty(at)grndwork(dot)com> |
| Cc: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, pgsql-general(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Increased storage size of jsonb in pg15 |
| Date: | 2023-12-28 18:23:52 |
| Message-ID: | 23b98884-10e6-4a2c-af8d-a0fad18c9f3c@aklaver.com |
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| Lists: | pgsql-general |
On 12/28/23 09:13, Sean Flaherty wrote:
> Follow-up:
> Working with AWS, we found that starting in RDS Postgres 15, the
> default_toast_compression parameter is set to use lz4 compression
> instead of pglz. This resulted in the increased json storage size we
> were seeing.
>
> I have been able to reproduce the increased storage size on RDS Postgres
> and using my local docker instance of postgres 15.5 by changing the
> local default_toast_compression value in postgresql.conf.
>
> I have attached the test script we use to create a table, insert some
> test records and a query to test the JSON data size on disk.
I can confirm I see the same results using Postgres 16 installed from
the PGDG repo on Ubuntu 22.04. That the lz4 data size is greater then
the pglz data size.
>
>
> Kind regards,
> Sean
>
--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com
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