Database Processing: Fundamentals, Design, ImplementationInformation Systems -- Database Management. |
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Page 239
... lock on item 100 7. Place lock on item 100 for B 8. Read item 100 for B 9. Set item count to 2 for B 10. Write item 100 for B 11. Release B's lock on item 100 B's transaction To prevent such sharing , the DBMS can place locks on data ...
... lock on item 100 7. Place lock on item 100 for B 8. Read item 100 for B 9. Set item count to 2 for B 10. Write item 100 for B 11. Release B's lock on item 100 B's transaction To prevent such sharing , the DBMS can place locks on data ...
Page 595
... lock from every DBM that stores that data - item . Locks are granted with specific restrictions . A read lock may be granted as long as no other transaction holds a write lock on the data - item . A write lock may be granted as long as ...
... lock from every DBM that stores that data - item . Locks are granted with specific restrictions . A read lock may be granted as long as no other transaction holds a write lock on the data - item . A write lock may be granted as long as ...
Page 599
... lock requests are accepted . If locks conflict , trans- actions are allowed to wait . Deadlock is detected in two main ways . One involves time - outs . Trans- actions are allowed to wait a certain period of time for a resource to be ...
... lock requests are accepted . If locks conflict , trans- actions are allowed to wait . Deadlock is detected in two main ways . One involves time - outs . Trans- actions are allowed to wait a certain period of time for a resource to be ...
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Common terms and phrases
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