Provides a separate file specification for the storage area
    snapshot file. The SNAPSHOT FILENAME argument can only be used
    with a multifile database.

    In a multifile database, the file specification is used for the
    RDB$SYSTEM storage area snapshot file, unless the CREATE DATABASE
    statement contains a CREATE STORAGE AREA RDB$SYSTEM clause that
    contains its own SNAPSHOT FILENAME clause.

    Do not specify a file extension other than .snp to the snapshot
    file specification. Oracle Rdb will assign the extension .snp
    to the file specification, even if you specify an alternate
    extension.

    If you omit the SNAPSHOT FILENAME argument, the .snp file gets
    the same device, directory, and file name as the database root
    file.