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Re: doubt about index


at insert, update and replace

2015-06-22 23:39 GMT-03:00 Justin Swanhart <greenlion@xxxxxxxxx>:

> Hi,
> If you do a code inspection you will find that uniqueness is checked on
> insertion, and the database cares not about it after that.
> --Justin
> On Mon, Jun 22, 2015 at 7:20 PM, Roberto Spadim <roberto@xxxxxxxxxxxxx>
> wrote:
>> and there's optimization with this flag? i see that equal could be
>> optimized cause if we found 1 row we can return to user that row and stop
>> select
>> in other words, if i see a index with primary key or unique columns,
>> could i change the index to unique and get some kind of performace? today i
>> think not ,cause unique key check if it's really unique (for example at
>> insert/update/replace), i'm wrong?

Roberto Spadim
SPAEmpresarial - Software ERP
Eng. Automação e Controle

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