Questions tagged «maxdop»

8
SQL Server的MAXDOP设置算法
设置新的SQL Server时,我使用以下代码来确定设置的良好起点MAXDOP: /* This will recommend a MAXDOP setting appropriate for your machine's NUMA memory configuration. You will need to evaluate this setting in a non-production environment before moving it to production. MAXDOP can be configured using: EXEC sp_configure 'max degree of parallelism',X; RECONFIGURE If this instance is hosting a …

2
MAXDOP = 1,并行查询提示和成本阈值
如果实例MAXDOP设置为1,并且查询提示用于允许特定查询并行进行,那么SQL仍然使用“并行成本阈值”来决定是否实际并行吗? 尽管此链接建议CTFP如果MAXDOP为1 ,则将其忽略。尽管有任何查询,无论成本如何,在没有查询提示的情况下,当MAXDOP值为1 时,它都将并行进行。 谁能让我知道这两个请求的预期行为? 范例1: Instance Maxdop: 1 CTFP: 50 Query hint: Maxdop=2 Query cost: 30 范例2: Instance Maxdop: 1 CTFP: 50 Query hint: Maxdop=2 Query cost: 70

4
SQL Server 2014的MAXDOP设置
我知道这个问题已经被问过很多次,并且也有答案,但是,我仍然需要更多有关该主题的指导。 以下是来自SSMS的CPU的详细信息: 以下是数据库服务器任务管理器中的“ CPU”选项卡: 我MAXDOP通过以下公式保持设置为2: declare @hyperthreadingRatio bit declare @logicalCPUs int declare @HTEnabled int declare @physicalCPU int declare @SOCKET int declare @logicalCPUPerNuma int declare @NoOfNUMA int declare @MaxDOP int select @logicalCPUs = cpu_count -- [Logical CPU Count] ,@hyperthreadingRatio = hyperthread_ratio -- [Hyperthread Ratio] ,@physicalCPU = cpu_count / hyperthread_ratio -- [Physical …
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