wasmith@gollum.UUCP (Wayne A. Smith) (02/12/90)
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 propogated to its copy(ies). Thanks in advance to any who respond. Wayne Smith E&M Columbia NCR Corporation wasmith@ncrcae.Columbia.NCR.COM
dell@pmday_1.Dayton.NCR.COM (Jim Dell) (02/13/90)
In article <275@gollum.UUCP> wasmith@ncrcae.Columbia.NCR.COM (Wayne A. Smith) writes: >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 propogated to its copy(ies). > >Thanks in advance to any who respond. > >Wayne Smith >E&M Columbia >NCR Corporation >wasmith@ncrcae.Columbia.NCR.COM -- Jim Dell e-mail: NCR Corporation Jim.Dell@dayton.NCR.COM 1334 South Patterson Blvd. (513)-445-4181 Dayton, OH 45479 622-4181 (VoicePlus)
corpspt@oracle.com (David E. Anderson) (02/14/90)
In article <275@gollum.UUCP> wasmith@ncrcae.Columbia.NCR.COM (Wayne A. Smith) writes: >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 propogated to its copy(ies). > >Thanks in advance to any who respond. > >Wayne Smith >E&M Columbia >NCR Corporation >wasmith@ncrcae.Columbia.NCR.COM The Advanced Services organization within Oracle Corporation sells a table replication facility that is an add-on to the kernel. I do not know the details, so you would have to contact someone at a sales office for literature. David
pan@propress.com (Philip A. Naecker) (02/23/90)
In article <275@gollum.UUCP>, wasmith@gollum.UUCP (Wayne A. Smith) writes: > 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 propogated to its copy(ies). > Digital sells a product called the VAX Data Distributor. VDD works with Rdb to distribute data to and from Rdb databases. The distribution can be either from a central database (where the updates take place) to one or more remote databases, or the other way 'round (as in rollup of data from branch offices, for example. VDD is quite smart about how it updates the remote databases, in that it can either send the entire database or relation, or just those records that have been updated. It also can be set up to send updates with various periodicity (or immediately), such as "send this out every Tuesday night". There are some limitations, but overall VDD solves several of the problems of distributing data to or from multiple sites. If you need more info, get the VDD Software Product Description from DEC. _______________________________________________________________________________ Philip A. Naecker Consulting Software Engineer Internet: pan@propress.com Suite 101 uunet!prowest!pan 1010 East Union Street Voice: +1 818 577 4820 Pasadena, CA 91106-1756 FAX: +1 818 577 0073 Also: Technology Editor DEC Professional Magazine _______________________________________________________________________________