I have setuped database in my bungeecord network, but i want import ranks to database from survival, i tried /lp import luckperms-h2.mv.db, but it gave an error ,i heard that luckperms-h2.mv.db is the file where are the ranks stored, so help?

You should follow this guide if you want to change the storage method: https://luckperms.net/wiki/Switching-storage-types
The file name of the export file is anything (backup, data, perms, etc).

i tried, but still dosen't work

1. Stop your server. Switch your storage-method back to how it was originally (I presume it was H2).
2. Start your server and run /lp export data.
3. Stop the server, Switch your storage-method to the new database one.
4. Start the server, run /lp import data.
5. Voilà.

What did you try exactly? Please write down the exact steps you did.

Well i did /lp export data then /lp export perms then i restarted server, then i did 2 same again exept import over export and in other server i did /lp sync

Thanks, it worked.