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Re: array vs flat tables performance

From: "Oren Mazor" <oren(dot)mazor(at)gmail(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: Re: array vs flat tables performance
Date: 2005-08-30 14:40:32
Message-ID: op.swbsduk5v14azh@oren-mazors-computer.local (view raw or flat)
Thread:
Lists: pgsql-novice
this is just for closure.

the array is actually stored as a string by postgres. a string that  
happens to have lots of brackets in it. you only get processing overhead  
when you convert this string into a datastructure that makes sense for  
arrays.

Oren

On Mon, 29 Aug 2005 14:43:30 -0400, Oren Mazor <oren(dot)mazor(at)gmail(dot)com>  
wrote:

> I'm about to add another table to the project I'm working on and the  
> suggested plan of action is to use arrays. Since performance is an  
> issue, I'm wondering, what exactly is the difference?
>
> in other words, I could have a flat table such as:
>
> UID1 - ITEM1
> UID1 - ITEM2
> UID1 - ITEM3
> UID7 - ITEM12
>
> or I could use arrays:
>
> UID1 - {ITEM1,ITEM2,ITEM3}
> UID7 - {ITEM12}
>
> is the latter simply syntactic sugar for the former?
>
> thanks
> Oren
>



-- 
Oren Mazor // Developer, Sysadmin, Explorer
GPG Key: http://www.grepthemonkey.org/secure
"Ut sementem feceris, ita metes"

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