Database System ConceptsThis acclaimed revision of a classic database systems text offers a complete background in the basics of database design, languages, and system implementation. It provides the latest information combined with real-world examples to help readers master concepts. All concepts are presented in a technically complete yet easy-to-understand style with notations kept to a minimum. A running example of a bank enterprise illustrates concepts at work. To further optimize comprehension, figures and examples, rather than proofs, portray concepts and anticipate results. |
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Page 19
... stored , in the face of system crashes or attempts at unauthorized access . If data are to be shared among several users , the system must avoid possible anomalous results . A major purpose of a database system is to provide users with ...
... stored , in the face of system crashes or attempts at unauthorized access . If data are to be shared among several users , the system must avoid possible anomalous results . A major purpose of a database system is to provide users with ...
Page 305
... stored in disk 1 , the second bit in disk 2 , and so on until the eighth bit is stored in disk 8 , and the error - correction bits are stored in further disks . This scheme is shown pictorially in Figure 10.4 , where the disks labeled P ...
... stored in disk 1 , the second bit in disk 2 , and so on until the eighth bit is stored in disk 8 , and the error - correction bits are stored in further disks . This scheme is shown pictorially in Figure 10.4 , where the disks labeled P ...
Page 588
... stored in the database . There are several ap- proaches to storing this relation in the distributed database : • Replication . The system maintains several identical replicas ( copies ) of the relation . Each replica is stored at a ...
... stored in the database . There are several ap- proaches to storing this relation in the distributed database : • Replication . The system maintains several identical replicas ( copies ) of the relation . Each replica is stored at a ...
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account-number ACM SIGMOD International ACM Transactions algorithm attributes B-tree balance bank block branch-city branch-name bucket buffer candidate key Chapter commit concurrency concurrency control conflict serializable consider constraints contains customer-city customer-name customer-street data item data model database system Datalog deadlock defined delete depositor disk distributed E-R diagram employee ensure entity set example execution expression failure functional dependencies graph implement insert loan loan-number log records main memory Management of Data multivalued dependencies node null object object-oriented operation optimization parallel partitioning performance pointers primary key processing processors protocol query query optimization r₁ read(A recovery relation schema relational algebra relational database relational-algebra relationship set result rolled back rule schedule search-key value Section serializability server SIGMOD stable storage stored structure superkey T₁ techniques timestamp Transactions on Database tuple relational calculus tuples update variables view serializability weak entity write write(Q