I have created database with my own program and it appeared as mydatabase.mv.db file.
But when I tried to access the same database with DbVisualizer, with apparently same parameters, it created two files mydatabase.lock.db and celebrity.h2.db and didn't see tables, created in the program.
What was the incompatibility?
UPDATE
both setups are follows:


In H2 version 1.3.x, the database file
<databaseName>.h2.dbis the default. (The storage engine "PageStore" is used).In H2 version 1.4.x, the database file
<databaseName>.mv.dbis the default. (The storage engine "MVStore" is used). The MVStore is still beta right now (November 2014). But you can disable the MVStore by appending;mv_store=falseto the database URL.