Database logical names and physical names may be different.
Physical name of the database: just the name on the disk exists.
Logical name: The internal name of the database.
Change the physical name of the database, and does not change the logical name of the database.
In layman's terms it is:
physical file name: the computer to find the file with.
Logical file name: the user can use the Chinese see it, in fact, a comment on the field.
Reproduced in: https: //my.oschina.net/hfq/blog/1839700