ACCESS_METHODS_DATASET_PARENT -- Used to synchronize child dataset access to the parent dataset during parallel operations. 官网的解释比较含糊,其实这个等待事件的本质是:SQL Server在执行TotalsSubTree超过查询阈值cost(默认为5)的SQL时会使用并行来完成,即多个threads并行完成一个SQL的查询,这样就需要各个线程进...
ACCESS_METHODS_DATASET_PARENT -- Used to synchronize child dataset access to the parent dataset during parallel operations. 官网的解释比较含糊,其实这个等待事件的本质是:SQL Server在执行TotalsSubTree超过查询阈值cost(默认为5)的SQL时会使用并行来完成,即多个threads并行完成一个SQL的查询,这样就需要各个线程进...
数据库和CPU似乎工作异常慢，而且我们有等待类型= LATCH_EX，ACCESS_METHODS_DATASET_PARENT，直到今天还...
This latch class is when a thread in a parallel scan needs access to the parent dataset, generally to get the next range of rows to scan. (Books Online description:“Used to synchronize child dataset access to the parent dataset during parallel operations.”) Questions/comments on this latch...
ACCESS_METHODS_DATASET_PARENT -- Used to synchronize child dataset access to the parent dataset during parallel operations. 官网的解释比较含糊,其实这个等待事件的本质是:SQL Server在执行TotalsSubTree超过查询阈值cost(默认为5)的SQL时会使用并行来完成,即多个threads并行完成一个SQL的查询,这样就需要各个线程进...