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Re: doubt about index



If you do a code inspection you will find that uniqueness is checked on
insertion, and the database cares not about it after that.


On Mon, Jun 22, 2015 at 7:20 PM, Roberto Spadim <roberto@xxxxxxxxxxxxx>

> 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?

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