Why is my embedded h2 program writing to a .mv.db file

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This is now automatically enabled since version 1.4.177 Beta (2014-04-12).

You can disable it by adding ;MV_STORE=FALSE and ;MVCC=FALSE to the database URL

By default, the MV_STORE option is enabled, so it is using the new
MVStore storage. The MVCC setting is by default set to the same values
as the MV_STORE setting, so it is also enabled by default. For
testing, both settings can be disabled by appending “;MV_STORE=FALSE”
and/or “;MVCC=FALSE” to the database URL.

http://www.h2database.com/html/changelog.html

You should tell us, what exact version of H2 you use.

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