| 词条 | DBC 1012 |
| 释义 |
The DBC/1012 Data Base Computer was introduced by Teradata Corporation in 1984, as a back-end data base management system for mainframe computers.[1] 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.[2][3] The DBC/1012 was designed to manage databases up to one terabyte (1,000,000,000,000 characters) in size; "1012" in the name refers to "10 to the power of 12".[4] Major components included:
The DBC/1012 was designed to scale up to 1024 Ynet interconnected processor-disk units. Rows of a relation (table) 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 (RAID) 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.[5]There were at least four models, marketed through about 1993.[6][7] References1. ^{{Cite news |title= Will Teradata revive a market? |author= Paul Gillin |pages= 43, 48 |work= Computer World |date= February 20, 1984 |url= https://books.google.com/books?id=5pw6ePUC8YYC&pg=PA48 |access-date= March 13, 2017 }} {{DEFAULTSORT:Dbc 1012}}2. ^{{Cite journal |title= The benefits of database computers |date= April 15, 1991 |work= Second International Specialist Seminar on the Design and Application of Parallel Digital Processors |author= J. Page |pages= 112-117 |isbn= 0-85296-519-2 }} 3. ^{{Cite journal |title= A practical implementation of the data base machine-Teradata DBC/1012 |date= January 7, 1992 |work= Twenty-Fifth Hawaii International Conference on System Sciences |author= R. D. Sloan |doi= 10.1109/HICSS.1992.183180 }} 4. ^{{Cite book |title= Past, Present, Parallel: A Survey of Available Parallel Computer Systems |pages= 226-231 |editors= Arthur Trew, Greg Wilson |date= December 6, 2012 |publisher=Springer Science & Business Media |isbn= 9781447118428 |url= https://books.google.com/books?id=HZzeBwAAQBAJ&pg=PA226 |access-date= March 13, 2017 }} 5. ^{{Cite journal |title= Integration of the optical storage processor and the DBC/1012 database computer |date= May 7, 1990 |work= Tenth IEEE Symposium on Mass Storage Systems |publisher= IEEE |author= N.C. Ramsay |doi= 10.1109/MASS.1990.113576 }} 6. ^{{Cite web |title= AT&T / NCR Products 1992 & 1993 Catalogue: DBC/1012 Model 4 |work= Website of the UK Retirement Fellowship |url= http://www.ncr.org.uk/page468.html |access-date= March 13, 2017 }} 7. ^{{Cite web |title= Colior image of TeradataDBC/1012 Data Base Computer with front covers removed |work= Artifact detail |publisher= Computer History Museum |url= http://www.computerhistory.org/collections/catalog/102713122 |access-date= March 13, 2017 }} 2 : Mainframe computers|Teradata |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。