6. Parallel related operations
This type of operation is related to the parallel operation in the SQL statement execution plan. Depending on the specific SQL statement and other related factors, the following operations may appear in the execution plan of the relevant SQL statement.
6.1. Parallel related concepts
1) Parallel operation: By decomposing the task (SQL statement) issued by the user into several subtasks, and handing them over to multiple service processes (or threads) for parallel execution, the efficiency of completing user tasks is improved. Parallel operations are generally used for low-concurrency OLAP services, such as BI, DW, etc.
2) Parallel execution plan: contains query coordinator