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Re: Best Way to update multiple rows, in multiple tables, with different data, containing over 50 million rows of data
Posted by: Peter Brawley
Date: January 13, 2020 12:39PM

Not as big as I expected given 50M rows needing updates, but three quarters of your data is in MyISAM tables, that limits optimisability. Let's see ...

select @@innodb_buffer_pool_size/1024/1024, @@key_buffer_size/1024/1024;

and the result of Explain on one of your updates along with the Show Create Table result for its table(s).

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