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* Understanding JSONB and TOAST tables
@ 2020-06-09 19:48 Wells Oliver <wells.oliver@gmail.com>
0 siblings, 1 reply; 2+ messages in thread
From: Wells Oliver @ 2020-06-09 19:48 UTC (permalink / raw)
To: pgsql-admin
Is there documentation that lays out how JSONB columns are stored? I have a
Rather Large Table with 37m+ rows with large JSONB objects, its size is
about 300mb, but there's an associated TOAST table with a 28GB size.
Curious how/why PSQL would store JSONB stuff this way.
Thanks!
--
Wells Oliver
wells.oliver@gmail.com <wellsoliver@gmail.com>
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Understanding JSONB and TOAST tables
@ 2020-06-09 22:59 Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
parent: Wells Oliver <wells.oliver@gmail.com>
0 siblings, 0 replies; 2+ messages in thread
From: Peter Eisentraut @ 2020-06-09 22:59 UTC (permalink / raw)
To: Wells Oliver <wells.oliver@gmail.com>; pgsql-admin
On 2020-06-09 21:48, Wells Oliver wrote:
> Is there documentation that lays out how JSONB columns are stored? I
> have a Rather Large Table with 37m+ rows with large JSONB objects, its
> size is about 300mb, but there's an associated TOAST table with a 28GB size.
>
> Curious how/why PSQL would store JSONB stuff this way.
TOAST is documented here:
https://www.postgresql.org/docs/current/storage-toast.html. JSONB is
handled like any other (variable-size) data type. You can use the
per-column storage settings mentioned on that page to perhaps achieve
different storage outcomes.
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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2020-06-09 19:48 Understanding JSONB and TOAST tables Wells Oliver <wells.oliver@gmail.com>
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