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PLINQ is Parallel Language Integrated Query. It is parallel implementation of the LINQ, in which a query may be executed by using several processors. PLINQ confirms scalability of the software on parallel processors in the execution environment. It is used at the place where data grows fastly, for example: in telecom industry or where data is heterogeneous.
PLINQ provide support to all the operators of LINQ. Moreover, you can query 'collections by using PLINQ. It can also run numerous LINQ queries consecutively and uses the processors over the system. Other than this, PLINQ uses parallel execution, which helps in running the queries quickly. Parallel execution also facilitates a chief performance improvement to PLINQ over certain types of legacy code, which takes longer period for executing.