Re: Max column number. - Mailing list pgsql-sql

From Viktor Bojović
Subject Re: Max column number.
Date
Msg-id CAJu1cLaSk01gdb0ktR_vTg_EC5TkbYf-f85TNOSqvq13_u=XCw@mail.gmail.com
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In response to Max column number.  (Miguel Angel Conte <diafano@gmail.com>)
List pgsql-sql
Hi Miguel,
maybe you can split table to two tables with one-to-one connection.
The another way is to create dynamic-attribute-tables which means to store data in columns, not in rows.


On Tue, Jul 12, 2011 at 7:48 PM, Miguel Angel Conte <diafano@gmail.com> wrote:
Hi,

I'm using postgresql 9 and I'd like to know if there is a way to "ask"  if when I'm going to add a column, I'm exceeding the max number of columns. I've found that the max number of columns is 1600 and It's depends of the data types. 
I've made a test adding 1600 columns using different data types and I didn't have any problem. The problem was when I tried to insert data. 

ERROR: row is too big: size 8168, maximum size 8160

I know that the row limit size is 8k by default, but I need a way to prevent this exception.

For example, my table have 600 columns and I insert a row with values for each column and the row size is 8000. So, in this case  If I want to prevent errors, I can't add more columns, but to do that I need to know about this limit situation.
Something like:
"If I'm not going to exceed the size limit, then  I can add a new column"

Thanks in advance,
Miguel.



--
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Viktor Bojović
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Wherever I go, Murphy goes with me

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