DWH varchar2(4000)

  • From: Ricard Martinez <ricard.martinez@xxxxxxxxx>
  • To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
  • Date: Mon, 22 Dec 2014 15:01:36 +0000

Hi list,

We have a DWH database on
The developers/data modelers are creating all the tables with
varchar2(4000) as standard by default. They don't care if they just insert
10 bytes, 200  or nothing.
When asked about why this standard is in place, the answer is just: "Just
in case we need it".

For my point of view this is not a good practice, as can cause memory waste
on client applications, as well as data garbage or errors like ORA-01450:
maximum key length (3218) exceeded.

But as i'm not a DWH expert, maybe im missing information that proves that
this is really a good practice, and not just a laziness way of working.

I will be glad to know your opinion, or point me to any doc/test that
proves me wrong, in order to learn about this.


Other related posts: