File Extension RDB File Format TrueVector Rules Database RDB stands for TrueVector Rules Database. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question Exchange 2013 Recover Mailbox Database I have some problem sending and receiving email in my ISA Server 2000 for certain users. Should you ever consider creating a fresh database for a user's e-mail?