DBC 1012


The DBC/1012 Data Base Computer was introduced by Teradata Corporation in 1984, as a back-end data base management system for mainframe computers.
The DBC/1012 harnessed multiple Intel microprocessors, each with its own dedicated disk drive, by interconnecting them with the Ynet switching network in a massively parallel processing system.
The DBC/1012 was designed to manage databases up to one terabyte in size; "1012" in the name refers to "10 to the power of 12".
Major components included:
The DBC/1012 was designed to scale up to 1024 Ynet interconnected processor-disk units. Rows of a relation were distributed by hashing on the primary database index.
The DBC/1012 used a 474 megabyte Winchester disk drive with an average seek time of 18 milliseconds. The disk drive was capable of transferring data at 1.9 MB/s although in practice the sustainable data rate was lower because the IO pattern tended towards random access and transfer lengths of 8 to 12 kilobytes.
The processor cabinet was 60 inches high and 27 inches wide, weighed 450 pounds, and held up to 8 microprocessor units.
The storage cabinet was 60 inches high and 27 inches wide, weighed 625 pounds, and held up to 4 disk storage units.
The DBC/1012 preceded the advent of redundant array of independent disks technology, so data protection was provided by the "fallback" feature, which kept a logical copy of rows of a relation on different AMPs. The collection of AMPs that provided this protection for each other was called a cluster. A cluster could have from 2 to 16 AMPs.
The product could be integrated with optical disc drives. There were at least four models, marketed through about 1993.