What is a parallel database and explain how it works?

Parallel Execution

Parallel Execution is associated with the N-Client N-Server Model. It is carrying more than one server that enables the servicing of more than one client (processes or threads) at an equal time is known as Parallel Execution.

The aim of parallel execution to speed up the computer processing efficiency and raised its throughput, that is, the several processing that can be accomplished during a given interruption of time. The number of hardware increases with parallel execution and with it, the value of the system improves.
Parallel execution is created by assigning the information among the several functional units. For example, the arithmetic, logic, and shift operations can be separated into three units and the operands diverted to each unit under the direction of a control unit.