High DB Load

High DB load usually is the cause of the 302 Global Call Limit reached problem for M2.

It looks like this:

As an example we see that load started to grow at ~09:46

We can check log files at the similar time.

Here in /var/log/m2/gui_crash.log we can find:

--------------------------------------------------------------------------------
ID:         20181008094632
Class:      Mysql2::Error
Message:    Lock wait timeout exceeded; try restarting transaction
Controller: tariffs
Action:     import_csv2
----------------------------------------

Which clearly shows us that problem was caused by importing CSV Tariff file.

We can find such file in /tmp folder by the Modify Time and with name import_csv......csv