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Re: CPU RAM and IO Usage
Posted by: Peter Brawley
Date: March 28, 2018 09:53PM

I know nothing about "jawsdb". For help on that, ask its makers.

Where MySQL is installed in a Linux system, you can get a snapshot of memory use by running free -m in the terminal while MySQL is running.

To get a snapshot of potential memory demand from your databases, run this query in MySQL ...

select engine,data,indexes,total
from (
  select 
    ifnull(engine,'TOTALS') as engine, 
    concat(data,' GB') as data, 
    concat(indexes,' GB') as indexes, 
    concat(tot,' GB') as total,
    if(engine is null,-1,tot) as ord
  from (
    select   
      engine,  
      round( sum(data_length)/1024/1024/1024, 2 ) as data,  
      round( sum(index_length)/1024/1024/1024, 2 ) as indexes,  
      round( sum(data_length+index_length)/1024/1024/1024, 2 ) as tot
    from information_schema.tables
    where engine is not null and engine not in('information_schema','performance_schema')
    group by engine with rollup
  ) sums
) list
order by list.ord desc;

For more detailed info about how your MySQL installation is using memory, run ...

show variables;

show global status;

and post the results here so we can run them through an analysis scrip.

To find queries that use RAM inefficiently, turn on the slow queries log, use the MySQL Explain cmd to analyse how those sloq queries should be optimised.



Edited 1 time(s). Last edit at 03/28/2018 10:31PM by Peter Brawley.

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