From the mysql page you reference:

Note that you must run the command that generates the data to be loaded and the mysql commands either on separate terminals, or run the data generation process in the background (as shown in the preceding example). If you do not do this, the pipe will block until data is read by the mysql process.

Trying to open a fifo as write-only will block until something opens it to read.

In reply to Re: Trouble opening FIFO for speedy MySQL loading by Illuminatus
in thread Trouble opening FIFO for speedy MySQL loading by ultrachrome

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