Levelup creates .LDB file every time the database is opened again

In my application I'm using levelup to write a few values into a database, however I noticed that every time my node script restarts, it creates a new .LDB file in the database directory. Is this intended behavior? I call levelup(leveldown('./db/myDatabase')); every time my code starts, and it basically creates a new .LDB file when it starts again. Also calling db.close() has no effect for me. Is this intended behavior, a problem with levelDB or a flaw in my coding? I'd love to know.

Best regards,

Nick

[ralphtheninja]

It's intended behavior.

[huhengyuan]

It's intended behavior.
How to solve this problem? I don't want to create ldb files frequently.I use singleton mode to create objects and export them using module.exports = db;
I have this doubt for a long time. Please tell me whether it can be solved. Thank you very much.