We need in-memory sql server database for java unit testing ,Can you provide information on it

We need in-memory sql server database 

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Since SQL Server 20016 Service Pack 2 the In-Memory feature is available in all Editions, even in the free Express Edition, see

Editions and supported features of SQL Server 2019 - SQL Server | Microsoft Docs

=> RDBMS scalability and performance => In-Memory Database: In-Memory OLTP

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Can you provide information  so that we can create 

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And what for detailed informations are you looking for? You can find a complete documentation on MSDN with all required steps.

Olaf