MySQL Forums
Forum List  »  InnoDB

Re: Very slow performance when inserting, updating, deleting and changing schema
Posted by: Peter Brawley
Date: January 27, 2021 04:15PM

Esp. for big DBs, innodb_buffer_pool_size needs to 70-75% of available RAM, and for best p[erformance, you want enough RAM for any given DB to fit entirely in RAM.

Let's see the result of ...

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;

Options: ReplyQuote


Subject
Views
Written By
Posted
Re: Very slow performance when inserting, updating, deleting and changing schema
37
January 27, 2021 04:15PM


Sorry, only registered users may post in this forum.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.