MySQL Reference Manual for version 4.0.18.

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7.5.5 How MySQL uses DNS

When a new client connects to mysqld, mysqld spawns a new thread to handle the request. This thread first checks if the hostname is in the hostname cache. If not, the thread attempts to resolve the hostname:

You can disable DNS hostname lookups by starting mysqld with the --skip-name-resolve option. However, in this case you can use only IP numbers in the MySQL grant tables.

If you have a very slow DNS and many hosts, you can get more performance by either disabling DNS lookups with --skip-name-resolve or by increasing the HOST_CACHE_SIZE define (default value: 128) and recompiling mysqld.

You can disable the hostname cache by starting the server with the --skip-host-cache option. To clear the hostname cache, issue a FLUSH HOSTS statement or execute the mysqladmin flush-hosts command.

If you want to disallow TCP/IP connections entirely, start mysqld with the --skip-networking option.



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