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Re: Website becomes slow when simultaneous users are more
Posted by: Peter Brawley
Date: July 08, 2018 10:42AM

Many possible culprits including under-resourced web server, under-resourced MySQL installation, suboptimal MySQL configuration, inefficient database design, inefficient queries.

So we can get a first take on the possible MySQL factors in your multi-user slowness, please ...

(i) post the result of ...

select engine,data,indexes,total
from (
    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 (
      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;

(ii) post the results of running these queries ...

show variables;

show global status;

(iii) post the result of this OS cmd ...

free -m

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Re: Website becomes slow when simultaneous users are more
July 08, 2018 10:42AM

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