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Posted by: Khurram Naseem
Date: August 09, 2016 07:06AM

Hi,

We have two tables (A=38 million rows) & (B=20 millions of rows), when we run count query after join both table (join column indexed) and we provide one where clause ( also indexed ). The query examine 200 thousand rows and return count. Query took 200 milliseconds to execute.

My first question is that is this time is OK! or we need to reduce this time ?

Second question when I use same query with mysqlslap with 100 concurrent value it took four minute to complete, why it took so long? A simple count query is not blocking on Innodb engine.

The testing instance has 15 GB RAM and 2VCPU (AWS RDS).

Thank you

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