智能化下的产物，无人棋牌室
PostgreSQL 9.6 发布了，与9.5版本相比，新版本在配置文件中引入了新的参数 ：
- max_parallel_workers_per_gather: the number of workers that can assist a sequential scan of a table;
- min_parallel_relation_size: the minimum size that a relation must have for the planner to consider the use of additional workers;
- parallel_setup_cost: the planner parameter that estimates the cost of instantiate a worker;
- parallel_tuple_cost: the planner parameter that estimates the cost of transferring a tuple from one worker to another;
- force_parallel_mode: parameter useful for testing, strong parallelism and also a query in which the planner would operate in other ways.
详情：PostgreSQL 9.6: Parallel Sequential Scan
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