Re: Identify root-cause for intermittent spikes

Hello,

Your problem is probably, too many active, concurrent connections.  Get
it from here the db directly:
select datname, usename, application_name, substring(query, 1, 80)
query  from pg_stat_activity where state in ('active','idle in
transaction');

Compare the number of rows returned with the number of vCPUs.  If it's
more than double the number of vCPUs in your AWS instance class, then
you are cpu saturated.

Regards,

Michael Vitale

Sengottaiyan T wrote on 10/11/2022 7:06 AM:
>
> Hi All,
>
> I'm looking for suggestions:
>
> Environment: AWS PostgreSQL RDS instance - Version 14.3
> Operations support gets intermittent alerts from the monitoring
> tool through AWS cloud watch metrics on Disk Queue Depth, CPU
> burst-credit & CPU Utilization.
> I would like to understand what is causing the spike - is the
> number of logon's increased, (or) number of transactions per
> second increased, (or) SQL execution picked wrong plan and the
> long running (I/O, CPU or memory intensive) SQL is increasing load
> on server (cause and effect scenario) etc.,
>
> Due to the reactive nature of the issues, we rely on the metrics
> gathered in the AWS cloud watch monitoring (for the underlying OS
> stats), Performance Insights (for the DB performance) and
> correlate SQL queries with pg_Stat_Statements view. But the data
> in the view is an aggregated stats. And, I'm looking to see the
> deltas compared to normal runs.
> How should I approach and get to the root-cause?
>
> AppDynamics is already configured for the RDS instance. Are there
> any open source monitoring tools available which would help to
> capture and visualize the deltas?
>
> Thanks,
> Senko
>