dell@pmday_1.Dayton.NCR.COM (Jim Dell) (02/14/90)
In article <275@gollum.UUCP> wasmith@ncrcae.Columbia.NCR.COM (Wayne A. Smith) >Are there any existing databases (products or research >prototypes) that feature replication? That is, are there >any databases that allow two copies on a network to be >maintained strongly consistent with each other? When one >is updated, that change is propagated to its copy(ies). > The NCR 9800 Data Base System Relational (DBSR) features mirroring. But in the true sense of your question it is not a network data base like TOTAL or probably as you mean geographically distributed. This is a planned enhancement. Another option of the 9800 is UNION. UNION is a software/hardware combination allowing the 9800 and a NCR Tower to exist in the same system and communicating over the system bus. With this system, mirroring is possible. As far as we know any UNIX-based data base can be mirrored using UNION. -- Jim Dell e-mail: NCR Corporation Jim.Dell@dayton.NCR.COM 1334 South Patterson Blvd. (513)-445-4181 Dayton, OH 45479 622-4181 (VoicePlus)