Re: Increased storage size of jsonb in pg15

We did a little more digging on our side, which I apologize for not
doing beforehand.

We wrote a script to create a simple table with a jsonb column, inserted
some json data into the column and then used *pg_column_size* to test the
size of the jsonb data column.

We ran the script against local docker versions of postgres 14.8 and 15.5
and saw that the data in the jsonb column was the same size.

We then ran the script on AWS RDS Postgres and saw a size difference for
the same json data between versions 14.8 and 15.4 (we also saw the larger
size on RDS postgres 15.5 and 16.1).

*Version* *size (kb)* *notes *
RDS Postgres-14.8 1587 (the same size we were seeing locally)
RDS Postgres-15.4 2112

Thank you for your prompt responses and assistance.

If you are curious, I can share the script we used with you.

Kind regards,
Sean

On Thu, Dec 14, 2023 at 9:47 AM David G. Johnston <
david(dot)g(dot)johnston(at)gmail(dot)com> wrote:

> On Thu, Dec 14, 2023 at 7:48 AM Sean Flaherty <sflaherty(at)grndwork(dot)com>
> wrote:
>
>> We have a process that runs once an hour to read the .dat file in csv
>> format then a node script using the pg package
>> <https://github.com/brianc/node-postgres> version "8.8.0" to create the
>> json objects and insert the data records as jsonb data.
>>
>> None of the upload process changed during the underlying database upgrade.
>>
>
> Basic debugging requires the existence of a self-contained reproducer. In
> this case ideally one that only uses psql and some static (already
> processed) data files, and that is known to produce the observed behaviors
> on non-RDS PostgreSQL.
>
> David J.
>
>