Interaction of Cluster Components

Parallel Execution of Queries

By default, SingleStore will create one partition per CPU core on the leaves for maximum parallelism. This number is configurable cluster-wide with the default-partitions-per-leaf variable, or as an optional parameter to CREATE DATABASE.

In the context of query execution, a partition is the granular unit of query parallelism. In other words, every parallel query is run with a level of parallelism equal to the number of partitions. You can view the partitions in a database with SHOW PARTITIONS.