MYSQL Query Performance Related Issue

[Devang Dhandhalya]

Hi All

I Want to discuss about Mysql query performance related,
We are Using AWS RDS Mysql Database ,AWS  RDS CPU Usage is upto 100% when
we perform load test of outbound calls .

Problem : Actually we are using This Mysql Query to get price and rateid
with use of Dialled Number with most length match in table using Substring
aggregate functions and minimum rate for same Dialled Number with Substring
fucntion in Deckrate Table


Query : select deckrate.rate as carrierPrice,deckrate.rateid from deckrate
where code=SUBSTRING('12345566878',1,length(deckrate.code)) and
rate=(select min(rate) from deckrate where
code=SUBSTRING('12345566878',1,length(code))) limit 1

Setup :
we are running this query from Freeswitch using lua script
when we perform load test calls at that time this query Execute for Every
Calls and AWS RDS CPU usage gradually increasing and its upto 100% of CPU
usage

we also try with Store Procedure method to decrease query execution time ,
when we run load test with store procedure after that also getting high cpu
usage , actually what we found this substring going to check all 0.5M
record in table and find most number of length match with dialled number so
i think that aggregate function takes time , Approx 2000 Queries will get
executed simultaneously as per call flow.

Kindly suggest any other option or method to perform this Query or any
modification required.

Thanks
Devang Dhandhalya

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