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Home -> Community -> Mailing Lists -> Oracle-L -> Re: adding a check condition
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Rachel Carmichael wrote:
> yes it adds to the overhead! and it will affect performance on every insert
> and update. Oracle has to get the check condition from the data dictionary.
>
> since you want this check on EVERY column, it might be faster to do it all
> at once in a before-insert/before-update trigger.
>
Hi, all
I think, trigger is slower and more expensive than check constraint(s) because
of PL/SQL engine is not as much efficient as Oracle core functions. One table
level check constraint would be the most effective solution.
Vadim Gorbunov
Oracle DBA
>
> Rachel
>
> >From: "Anand Raman" <araman_at_india-today.com>
> >Reply-To: ORACLE-L_at_fatcity.com
> >To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> >Subject: adding a check condition
> >Date: Mon, 12 Jun 2000 22:57:04 -0800
> >
> >Hi guys
> >In a database which i am desiging to prevent users from entering blank
> >spaces into columns i am also
> >adding a check condition like check column <> ' ' to almost every column..
> >Does this add to the overhead of the table and will it have any performance
> >effect ..
> >Thanx
> >Anand
> >
> >--
> >Author: Anand Raman
> > INET: araman_at_india-today.com
> >
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> --
> Author: Rachel Carmichael
> INET: carmichr_at_hotmail.com
>
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