[Freeswitch-users] MYSQL Query Performance Related Issue

[Devang Dhandhalya]

Hi Christian

Yes we start using IN operator instead of substring aggregate function

Thank you so much for your Response :)

Regards
Devang Dhandhalya


On Fri, Apr 1, 2022 at 6:02 PM Christian Berger <
christian.berger at foncloud.net> wrote:

> Hi,
>
> Am 01.04.22 um 14:20 schrieb Devang Dhandhalya via FreeSWITCH-users:
> > and rate=(select min(rate) from deckrate where
> > code=SUBSTRING('12345566878',1,length(code))) limit 1
>
> Here is your problem. That statement will mean that your database will
> have to manually go through _all_ entries in the decrate table as it
> needs to calculate the SUBSTRING for every entry.
>
> The better solution is to have an index on "code" an a query like...
> code in ('12345678', '1234567', '123456'...'12','1')
>
> With such a query the index will be used and it'll be _much_ faster.
>
>
> Christian Berger
>
>
>
>
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