Active Database Systems by NORMAN W PATON pptx

... Applied to Active Object-Oriented Systems Based on Cϩϩ Active Database Systems •81 ACM Computing Surveys, Vol. 31, No. 1, March 1999 Active Database Systems NORMAN W. PATON University of Manchester AND OSCAR ... ء h.value from h in Holder, o in Owns, Active Database Systems •77 ACM Computing Surveys, Vol. 31, No. 1, March 1999 s in Stock do ͗reduce quantity of s own...

Ngày tải lên: 23/03/2014, 16:21

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Ngày tải lên: 24/12/2013, 12:17

... strange ways. Here is an example of what could go wrong if the DBMS were completely unconstrained as to the order in which it operated upon the database. IT-e emphasize that database systems ... www.verypdf.com to remove this watermark. 402 CHAPTER 8. SYSTE.U ASPECTS OF SQL When using the generic SQL interface, each statement is normally a transac- tion by itself.= However,...

Ngày tải lên: 21/01/2014, 18:20

... "pipelining," in a useful way. In some cases, almost all the work would need to be done by the Open function, which is tantamount to materialization. However, if we only want part of R, we often are able ... Split-Merge on www.verypdf.com to remove this watermark. 720 CHAPTER 15. QUERY EXECUTIOiV Why Iterators? We shall see in Section 16.7 how iterators support efficien...

Ngày tải lên: 21/01/2014, 18:20

... important contribution to this. Acknowledgements We thank our colleagues, collaborators, and cowork- ers, who contributed substantially to the work that is reviewed here: Adelbert Bacher (Technical ... Jolla), Monika Joshi (University of Iowa), Chris Kay (University College London), Radoslaw Kowalczyk (University of War- wick), Gerhard Link (Albert-Ludwigs-University of Freiburg), Klaus Mo ¨...

Ngày tải lên: 16/03/2014, 02:20

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Ngày tải lên: 14/12/2013, 16:15

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Ngày tải lên: 14/12/2013, 16:15

... COP 4710: Database Systems (Day 4) Page 55 Mark Llewellyn • Now we must consider what it the main difference between these two definitions of an employee? • Treating ... Florida Instructor : Mark Llewellyn markl@cs.ucf.edu CC1 211, 823-2790 http://www.cs.ucf.edu/courses/cop4710/spr2004 COP 4710: Database Systems (Day 4) Page 61 Mark Llewellyn • Two problems arise as ... a datab...

Ngày tải lên: 24/12/2013, 12:16

... 4710: Database Systems (Day 5) Page 19 Mark Llewellyn • Given this scenario, now suppose that we want to record the managers for tasks performed by an employee at a branch office; that is, we want ... managed by which manager. COP 4710: Database Systems (Day 5) Page 21 Mark Llewellyn • When you look at the E-R diagram which models this situation, it would appear that the re...

Ngày tải lên: 24/12/2013, 12:16

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Ngày tải lên: 21/01/2014, 09:20