Re: mysql out of memory
Posted by: Peter Brawley
Date: November 21, 2019 10:49AM

RAM settings need to be tailored to loads & resources. What is the MySQL version? What is innodb_buffer_pool_size? How much RAM does the machine have, how much is used by other processes?

Then 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 the following queries in the mysql client program ...

show variables;

show global status;

-- if mysql 5.7 or later ...

select * from sys.memory_global_total;

substring_index(event_name,'/',2) as code_area,
sys.format_bytes( sum(current_alloc) ) as current_alloc
from sys.x$memory_global_by_current_bytes
group by substring_index(event_name,'/',2)
order by sum(current_alloc) desc;

concat(format(a.num * 100.0 / b.num,2),"%") bufferpoolfullpct
(select variable_value num from performance_schema.global_status
where variable_name = 'innodb_buffer_pool_pages_data') a,
(select variable_value num from performance_schema.global_status
where variable_name = 'innodb_buffer_pool_pages_total') b;

-- and look for runaway mem use in the results of ...

select * 
from performance_schema.memory_summary_global_by_event_name
where event_name like 'memory/performance_schema/%';

(iii) post the result of running from the terminal prompt ...

free -m

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Written By
November 21, 2019 01:20AM
Re: mysql out of memory
November 21, 2019 10:49AM
November 22, 2019 12:08PM

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