ON DEMAND PARALLELISM FOR COLUMNSTORE INDEX BUILD

摘要

The degree of parallel processing used to build a database index can be dynamically adjusted based on actual memory usage of individual parallel processing units. Memory can be reserved to prevent an out-of-memory condition. A predetermined number of initial parallel processing units can be activated. The actual usage of resources by the initial activated parallel processing unit(s) can be measured to establish an initial baseline for resource consumption per parallel processing unit. The baseline for resource consumption per parallel processing unit can be used to determine how many additional parallel processing units are activated. The actual resource usage of each parallel processing unit can be measured and used to refine the baseline memory usage. The refined average memory usage can be used to determine how many additional parallel processing units are activated.