Lecture Database management systems Chapter 3 The enhanced entity relationship (EER) model

... everything in the database Database management systems - Using a database for document management - page Using a database for management There are advantages to using systems that manage both document ... same database System Document Meta Data Document Documents Database Using a database for management It is often easier to create a syste...

Ngày tải lên: 31/03/2014, 20:20

... and clock 7.4.2 Buffer Management in DBMS versus OS Obvious similarities exist between virtual memory in operating systems and buffer management in database management systems In both cases the ... horatio Figure 6.1 rating 10 age 45.0 35 .0 35 .0 An Instance of Sailors query prints the value 38 .3: Sailors sid sname rating age A P.AVG A Thus, the value 35 .0 is counted twice i...

Ngày tải lên: 08/08/2014, 18:22

... Objectives At the end of this lesson, you will: • understand the functionalities offered by CDS/ISIS, a textual DBMS; • understand the technical work needed by developers to implement these functionalities; ... understanding of the concepts covered in this lesson Good luck! Exercise What is CDS/ISIS? A set of tools for relational database management A textual...

Ngày tải lên: 31/03/2014, 20:20

... 82 Fate of Pharmaceuticals in the Environment and in Water Treatment Systems the fraction of pharmaceuticals that are bound to solids in environmental studies instead of just concluding that the ... for drinking water, pond water, and well water. 48 The binding of estrogens to an MIP developed to aid in the analysis of estrogens in natural wa...

Ngày tải lên: 18/06/2014, 16:20

... DEFINITIONS The drawer of the check is the customer of the bank The drawer writes the check The drawee is always the bank The payee of the check is entitled to present the check for payment to the bank ... Payee 3, and Payee may present the draft to the drawee for payment The endorsements on the back of the check may then appear as shown in Exhib...

Ngày tải lên: 02/07/2014, 16:21

... Subsurface 3. 4.1.1 Dilution (Recharge) 3. 4.1.2 Advection 3. 4.1 .3 Dispersion 3. 4.2 Phase Transfers 3. 4.2.1 Sorption 3. 4.2.2 Stabilization 3. 4.2 .3 Volatilization 3. 4 .3 Transformation Mechanisms 3. 4 .3. 1 ... military activities and include the explosives trinitrotoluene (TNT), royal Dutch explosive (RDX or hexahydro-1 ,3, 5-trinitro-1 ,3, 5-triazine), and octahydro-1...

Ngày tải lên: 11/08/2014, 04:20

... all of opposite sign than those of the main field This indicates a weakening of the dipole field From the numbers in CHAPTER THE MAGNETIC FIELD OF THE EARTH 98 Table 7.1 of Stacey and eq (3. 43) ... solution of the vector diffusion equation is z z H = H0 e− δ ei(ωt− δ ) (3. 65) CHAPTER THE MAGNETIC FIELD OF THE EARTH 104 with δ= ωσµ0 (3. 66) the sk...

Ngày tải lên: 04/12/2015, 00:25

... 43 . 77 49 .56 53. 52 65 .42 73. 15 88. 63 107 .32 125 .49 139 .67 160.27 52.65 52.25 51.07 49 . 74 49.00 48 .50 46 .92 46 .00 44 . 04 41.66 39 .33 37 .52 34 .89 3. 338 3. 338 3. 338 3. 338 3. 338 3. 338 3. 338 3. 338 3. 338 ... 0 83 120 237 33 7 43 8 531 6 74 4 .33 4 4.260 4. 026 3. 826 3. 6 24 3. 43 8 3. 152 1.152 1.651 3. 1 74 4 .40 7 5.595 6.621 8.101 14....

Ngày tải lên: 16/08/2013, 15:29

... used to manipulate relational databases The Relational Database Concept • Proposed by Dr Codd in 1970 • The basis for the relational database management system (RDBMS) • The relational model contains ... defined and established in an ad-hoc manner ~ Croswell, 1991 Relational Database Management System - a database system made up of files with data elements in two-dimen...

Ngày tải lên: 17/03/2014, 00:20

... know that an instance of a 'technical document' can have a title and subject Database management systems - Using a database for document retrieval - page 10 Metadata search We can implement an indexed ... Integration with applications and workflow systems Database management systems - Using a database for document retrieval - page 13 Information portals...

Ngày tải lên: 31/03/2014, 20:20

... by the two main types of databases: textual and relational Database management systems - Textual, relational and xml databases – page Flat file databases The flat file database can be considered ... following types of database can meet your needs? A relational database A textual database Please click on the answer of your choice Database management systems -...

Ngày tải lên: 31/03/2014, 20:20

... with a relational database SQL is more than simply a query language; it is a database sub-language and is becoming the standard interface to relational and non -relational database management systems ... packages, SQL/ DS and DB2, on this language SQL was adopted as an industry standard in 1986 (SQL- 86) Since then there has been three more standards, SQL- 89, SQL2...

Ngày tải lên: 31/03/2014, 20:20

... Essential Delphi for NET – Copyright 2004, Marco Cantù (www.marcocantu.com/d8ebook) – Page 10 Chapter 3: The Delphi Language in Delphi for NET T he transition from Delphi to Delphi marks the ... with Delphi 7, the company formally announced the new name for the language itself, to highlight the core ancestry of the tool with other, like the Kylix fo...

Ngày tải lên: 16/04/2014, 11:14

... System Support for Software Fault Tolerance in Highly Available Database Management Systems by Mark Paul Sullivan Abstract Today, software errors are the leading cause of outages in fault ... differences in the risk to data in main CHAPTER INTRODUCTION memory and on disk 1.3 Existing Approaches to Software Fault Tolerance Current strategies for reduci...

Ngày tải lên: 28/04/2014, 13:32