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Re: Changing table engine to innodb manually
Posted by: Peter Brawley
Date: January 14, 2021 12:08PM

InnoDB needs specific memory buffer settings tuned to available RAM and the database load. How much RAM is available to MySQL? Let's see 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;

And queries often need covering indexes. Such needs must be analysed per-query.

Therefore you need a non-production testbed that reproduces runtime conditions, allowing you to regression0-test such changes.

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Re: Changing table engine to innodb manually
January 14, 2021 12:08PM

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