Huge Database Spikes

Hi all,

Since updating a bunch of sites to WP 4.9.5, we’re seeing huge spikes in database usage which in turn triggers Pingdom alarms and sites go down for a few minutes.

We’ve gone through all the usual processes, disabling plugins, themes etc. but the problem persists.

It seems to be happening on different hosts. Our providers are trying to find the route cause, but so far everything points to the last core update (based on timings).

We’re looking at rolling back to a previous core install to see if problem goes away but this will take time before we can verify.

Has anyone else come across this?

https://screencast.com/t/ZCkyNMpO

Thanks

Phil