How to change innodb_write_io_threads in MySQL

The innodb_write_io_threads value determines the number of I/O threads for writing to InnoDB. The default is 4, the minimum possible is 1, the maximum is 64.

I will give an example of viewing the current value:

show variables like 'innodb_write_io_threads';

You cannot change the value without restarting the MySQL server, I will give an example of an error:

SET global innodb_write_io_threads=32;
ERROR 1238 (HY000): Variable 'innodb_write_io_threads' is a read only variable

Therefore, we will indicate it in the MySQL server configuration file:


And restart the MySQL server:

service mysql restart

See also my article:
How to change innodb_thread_concurrency in MySQL

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