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MySQL 5.7 Reference Manual
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MySQL 5.7 Reference Manual  /  The InnoDB Storage Engine  /  InnoDB Configuration
User Comments
User comments in this section are, as the name implies, provided by MySQL users. The MySQL documentation team is not responsible for, nor do they endorse, any of the information provided here.
  Posted by Charly Molter on July 18, 2013
From this part of the doc:
# Set key_buffer to 5 - 50% of your RAM depending on how much
# you use MyISAM tables, but keep key_buffer_size + InnoDB
# buffer pool size < 80% of your RAM
It is not really clear but 'key_buffer_size' is a MyISAM parameter so the sentence above means that the more you use MyISAM table the higher key_buffer_size should be.

It wasn't really clear to me at the beginning.

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