Database Processing: Fundamentals, Design, ImplementationInformation Systems -- Database Management. |
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Page 183
... node may have . Node 2 has two children : nodes 5 and 6. Node 3 has no children . And node 4 has three Figure 6-17 Generic structure of M : N relationship Node 2 Node 5 Node 9 Logical Database Design 183 Trees and Networks Trees.
... node may have . Node 2 has two children : nodes 5 and 6. Node 3 has no children . And node 4 has three Figure 6-17 Generic structure of M : N relationship Node 2 Node 5 Node 9 Logical Database Design 183 Trees and Networks Trees.
Page 579
... ( Node Z is a transaction node . ) Further , the data changes are made in as close to real time as possible . Now consider another configuration , shown in Figure 15-4b . In this case , node W is a mainframe , nodes X and Y are ...
... ( Node Z is a transaction node . ) Further , the data changes are made in as close to real time as possible . Now consider another configuration , shown in Figure 15-4b . In this case , node W is a mainframe , nodes X and Y are ...
Page 601
... node A fails , then node D fails . Next , transaction 1 writes Y on all nodes that contain Y. To do so , it must first obtain a write lock on those nodes . The only such node is C , given that node D has failed . Consequent- ly ...
... node A fails , then node D fails . Next , transaction 1 writes Y on all nodes that contain Y. To do so , it must first obtain a write lock on those nodes . The only such node is C , given that node D has failed . Consequent- ly ...
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1:N relationships Activity advisor Application Development application programs APPOINTMENT attributes binary relationships cation changes Chapter Class COBOL components constraints contains CUSTOMER data dictionary data items database administration database application database design database processing database system dataflow diagram DBMS engine DBMS products define delete DEPARTMENT object display DK/NF documentation domain definitions domain/key normal form EMPLOYEE entity example faculty file processing systems foreign key format fourth normal form functional dependency identify implementation interface invoice logical Major many-to-many menus meta-data microcomputer modification anomalies modify multi-user multivalued dependencies object diagrams object instance object property operations overhead data personnel phase problem query relational model represent requirements SALESPERSON Samantha schedule screen second normal form shown in Figure Sname stored structure STUDENT data STUDENT object student records Student-ID subschema system development third normal form tion transaction processing programs tuple update user's