Domains vs data types

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От	Ertan Küçükoglu
Тема	Domains vs data types
Дата	20 августа 07:47:43
Msg-id	CAH2i4yf_M5NfX_kDu6_2Z+sgqLOZK9vCsF3EfmwZQyYFuAMxpg@mail.gmail.com обсуждение исходный текст
Ответы	Re: Domains vs data types Re: Domains vs data types Re: Domains vs data types
Список	pgsql-general

Hello,

I am using PostgreSQL 17.6.

I would like to learn if there is any benefit of using domains over data types for table column definitions in terms of performance gain/loss.

For example I might have table defined as below

create table test (

a integer,

b integer,

c integer,

d varchar(5)

);

I might also have ame table defined as below

create domain aint integer;

create domain s5 varchar(5);

create table test_domain (

a aint,

b aint,

c aint,

d s5

);

Does the second table have any technical advantage/disadvantage over plain data type definition?

Less metadata in memory? High metadata in memory? Less/increased disk space?

Thanks & Regards,

Ertan

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