# The C++ McoMultithreadedSqlEngine Class

This article is deprecated. Please see the following article instead.

> The McoMultithreadedSqlEngine class is a specialized subclass of McoSqlEngine designed for use in multithreaded applications where each thread has its own memory allocator. It instantiates a multithreaded allocator. There are no additional specialized methods; once instantiated, all of the methods invoked on a McoMultithreadedSqlEngine instance are implemented in the base class McoSqlEngine.

> (In eXtremeSQL version 4.5 and later both McoSqlEngine and McoMultithreadedSqlEngine will instantiate the same multithreaded engine; the two names are retained for backward compatibility.)