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I am sharding my data into multiple mysql databases, but sometimes I will need to gather information from multiple shards. How can I query multiple mysql databases in parallel in php?

I've seen some examples of asynchronous curl requests and shell_exec, but is there a more direct way?

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The new mysqlnd driver can perform asynchronous queries. Documentation is sparse, but there are some examples (also relating to sharding) in a presentation here.

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Here is a better link I think. mysqlperformanceblog.com/2013/03/06/…

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