New answers tagged parallelism
There is no hidden impact in raising the cost threshold for parallelism. As low as it is, SQL Server ships with a default cost threshold of 5, which is always taken into account when the optimizer compiles query plans. So, in this regard, the amount of work for the optimizer is the same. Whether raising the CTFP to a very high value is a good idea or not, ...
For Microsoft Dynamics CRM database server instance, you have to set MAXDOP 1. If using Enterprise edition, above answer using Resource governor makes sense. You can also look into using query hint OPTION (MAXDOP N) where N is a sensible value calculated based on number of logical processors and NUMA nodes of your sql server instance. Make sure that ...
There is an easy solution if you have Enterprise (expensive) Edition in use: Set maxdop at instance level as high as you want and use the resource governor to restrict all CRM users with their own workload group to maxdop 1.
So basically after some more research my conclusion is that parallel queries are just not possible with MySQL at all. The closest it looks like you can get is by using shard-query, but I believe this can only execute parallel queries against a single database when using partitioning, and partitioning does not support foreign keys. Foreign keys are a massive ...
Consider tossing several queries into a Stored Procedure. That way, single CALL to it is a single round trip to the server. For localhost this does not matter much. But if the app and MySQL are separate machines, and especially if they could be on separate sides of the continent, then bundling the queries together this way can be a significant speedup. ...
Recommend you work on speeding up each query. Parallel execution in PHP, especially on Windows, is mostly a myth. Better evidence
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