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Re: More then 1600 columns?

From: Dmitriy Igrishin <dmitigr(at)gmail(dot)com>
To: John R Pierce <pierce(at)hogranch(dot)com>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: More then 1600 columns?
Date: 2010-11-12 07:17:50
Message-ID: AANLkTin84spk-3d_ZVgdWZAcvdMubHek2UXij-hdiusg@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-general
Hey Mark,

Yeah, I can't imagine an entity in a real project even with more than 100
columns. Its rare case.
But if you entities (rows/tuples) of some class (table) can contains
variable
set of columns (properties) you can look at hstore contrib module.

2010/11/12 John R Pierce <pierce(at)hogranch(dot)com>

> On 11/11/10 9:24 PM, Tom Lane wrote:
>
>> "Mark Mitchell"<mmitchell(at)riccagroup(dot)com>  writes:
>>
>>> Is there are hard limit of 1600 that you cannot get around?
>>>
>> Yes.
>>
>> Generally, wanting more than a few dozen columns is a good sign that you
>> need to rethink your schema design.  What are you trying to accomplish
>> exactly?
>>
>>
>
> indeed.    I'd say a good read on 'data normalization' and the Third Normal
> Form would be in order.
>
> relational databases are *not* spreadsheets (and, for that matter,
> spreadsheets make lousy relational databases)
>
> if these 1600+ elements come from an ORM, you probably need to rethink your
> object model, as no sane object class should have that many members.
>
>
>
>
> --
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-- 
// Dmitriy.

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