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Shard-Query supports background jobs, query parallelism, and all SELECT syntax
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SkySQL just blogged about a tool to schedule long running MySQL jobs, prevent too many queries from running simultaneously, and stores the results in tables.  It even uses Gearman.  You will note that the article says that it uses PAQU, which uses Shard-Query.

I think PAQU was created for two reasons.  A) Shard-Query lacked support for fast aggregation of STDDEV and VARIANCE (this has been fixed), and B) their data set requires “cross-shard queries”.  From what I can see though, their type of cross-shard queries can be solved using subqueries in the FROM clause using Shard-Query, instead …

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