This option might fill your eventlog!
This is by design
First you need to know what autoclose does! If autoclose is set to "TRUE", the database is closed, and its resources are freed when no user connection accesses the database anymore. If set to "FALSE", the server maintains the database in an open and ready state regardless of user activity.
For MS SQL Server the default is set to "FALSE" so the database does not free any resources. This makes the database server quicker when the database is accessed again. For the Desktop Edition "TRUE" is the default. This is done because of the small footprint. Resources are freed whenever possible.
To switch the option to off you can use the following sql statement:
exec sp_dboption 'database_name','autoclose','off'
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.