MySQL - Concurrent SELECTS - one client waits for another?

This is just due to you doing it from the same machine, if the searches were coming from two different machines they would go at the same time. Would you really like one person to be able to bog down your MySQL server just by opening a bunch of browser windows and hitting refresh?

That is right. Each select query on a MyISAM table locks the entire table until it is finished. Their excuse is that this achieves "a very high read throughput".

Switching to innoDB will allow concurrent reads.

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