Good morning,
For performance point of view, are there big differences between:
char(N), varchar(N), varchar, text?
Some comments from google shows:
No difference, under the hood it's all varlena. Check this
article from Depesz: http://www.depesz.com/index.php/2010/03/02/charx-vs-varcharx-vs-varchar-vs-text/
A couple of highlights:
To sum it all up:
- char(n) – takes too much space when dealing with
values shorter than n, and can lead to subtle errors because
of adding trailing spaces, plus it is problematic to change
the limit
- varchar(n) – it's problematic to change the limit in
live environment
- varchar – just like text
- text – for me a winner – over (n) data types because
it lacks their problems, and over varchar – because it has
distinct name
So, can I assume no big performance differences?
Thanks alot!
Emi
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- [PERFORM] char(N), varchar(N), varchar, text Emi Lu
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