What is parallel query in SQL?

Question

Parallel query is a method used to increase the execution speed of SQL queries by creating multiple query processes that divide the workload of a SQL statement and executing it in parallel or at the same time.

What is parallel query server?

Parallel Query Processing. Without the parallel query feature, the processing of a SQL statement is always performed by a single server process. With the parallel query feature, multiple processes can work together simultaneously to process a single SQL statement. This capability is called parallel query processing.

How do I run a SQL query in parallel?

To achieve parallelism for SQL DML statements, you must first enable parallel DML in your session: ALTER SESSION ENABLE PARALLEL DML; Then any DML issued against a table with a parallel attribute will occur in parallel, if no PDML restrictions are violated.

What is parallel query processing?

Parallel query processing designates the transformation of high-level queries into execution plans that can be efficiently executed in parallel, on a multiprocessor computer. This is achieved by exploiting the way data is placed in parallel and the various execution techniques offered by the parallel database system.

What is parallel query in MySQL?

MySQL Cluster has a unique parallel query engine. It gives a consistent consolidated transactional view of the entire distributed partitioned dataset. This makes designing and programming scaleable distributed applications straightforward and extremely simple.

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