Increased size of database dump even though LESS consumed storage

Hi all,

for various reasons I've migrated my database schema from 4 tables
with some additional indexes to keep integrity and stuff to 1 table
only. That made some of the former used indexes obsolete and resulted
in overall less consumed storage:

The old schema consumed ~42 GiB, while the new is ~16 GiB without the
formerly available indexes and ~25 GiB with the same logical indexes.
Though, a created dump of the new schema has increased from ~5,52 GiB
to 6,38 GiB. Of course I'm using the same settings to create both
dumps:

> pg_dump.exe "--username=%USERNAME%" "--encoding=UTF-8" "--compress=9" "--format=c" "--dbname=%DB_NAME%" >
"%DMP_PATH%"

My expectation was that the dump would be smaller as well, because the
data itself is the same, while lots of duplicate IDs, obsolete indexes
etc. in not available tables anymore have been removed.

Any explanation for the increased dump size? Thanks!

The tables themself were changed like the following:

> CREATE TABLE clt_rec
> (
>   id          bigserial                 NOT NULL,
>   oms_rec     bigint                    NOT NULL,
>   captured_at timestamp with time zone  NOT NULL,
>   rssi        smallint                  NOT NULL
> );

> CREATE TABLE oms_rec
> (
>   id        bigserial NOT NULL,
>   meter     integer   NOT NULL,
>   encrypted bytea,
>   decrypted bytea
> );

> CREATE TABLE clt_rec_src
> (
>   id          bigserial NOT NULL,
>   real_estate integer   NOT NULL,
>   collector   integer   NOT NULL,
>   clt_rec     bigserial
> );

> CREATE TABLE meter_status_history
> (
>   id      serial  NOT NULL,
>   oms_rec bigint  NOT NULL,
>   status  smallint
> );

vs.

> CREATE TABLE datagram
> (
>   id            bigserial                 NOT NULL,
>   src_re        integer                   NOT NULL,
>   src_clt       integer                   NOT NULL,
>   src_meter     integer                   NOT NULL,
>   captured_at   timestamp with time zone  NOT NULL,
>   captured_rssi smallint                  NOT NULL,
>   oms_status    smallint                  NOT NULL,
>   oms_enc       bytea,
>   oms_dec       bytea
> );

Mit freundlichen Grüßen

Thorsten Schöning

--
Thorsten Schöning
AM-SoFT IT-Service - Bitstore Hameln GmbH i.G. ist ein Mitglied der Bitstore Gruppe - Ihr Full-Service-Dienstleister
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Für Rückfragen stehe ich Ihnen sehr gerne zur Verfügung.

Mit freundlichen Grüßen

Thorsten Schöning


Tel: 05151 9468 0
Fax: 05151 9468 88
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