\begin{abstract_eng}
Haskell is a purely-functional programming language.
It provides a modern type system which type-safe and type inference makes it possible to write a program reliable\cite{types}.
Haskell has referential transparency that allows the programmer and the compiler to reason about program behavior.

In this study, we implement the parallel database using Haskell.
It is use non-destructive tree structure.
Haskell compatible with non-destructive tree, because Haskell has no destructive updates does not exist

We measure the performance for reading and writing of parallel database.
We achieve to sufficient performance on the multi-core processor.
Further, in order to indicate the availability of practical applications, we measure our database against top of database.
\end{abstract_eng}