งานนำเสนอ PowerPoint
... Locking : A procedure used to control concurrent access to data. When one transaction is accessing the database, a lock may deny access to other transactions to prevent incorrect results. Locking methods are the most widely used approach to ensure serializability of concurrent transactions. There a ...
... Locking : A procedure used to control concurrent access to data. When one transaction is accessing the database, a lock may deny access to other transactions to prevent incorrect results. Locking methods are the most widely used approach to ensure serializability of concurrent transactions. There a ...
Upgrading SQL Server 2000
... • Stop replication and ensure that the replication log is empty. • Ensure that there is enough hard disk space available to perform the upgrade. • Make sure that you upgrade all databases that have cross-database dependencies at the same time. This will ensure that, for example, logon information f ...
... • Stop replication and ensure that the replication log is empty. • Ensure that there is enough hard disk space available to perform the upgrade. • Make sure that you upgrade all databases that have cross-database dependencies at the same time. This will ensure that, for example, logon information f ...
Concurrency_Control_Techniques
... waits or restarted and never gets a chance to proceed further. In a deadlock resolution it is possible that the same transaction may consistently be selected as victim and rolled-back. This limitation is inherent in all priority based scheduling mechanisms. In Wound-Wait scheme a younger transaction ...
... waits or restarted and never gets a chance to proceed further. In a deadlock resolution it is possible that the same transaction may consistently be selected as victim and rolled-back. This limitation is inherent in all priority based scheduling mechanisms. In Wound-Wait scheme a younger transaction ...
An Overview of Production Rules in Database Systems
... in products and proposed standards. Important research projects, all of which are described in this paper to some extent, include (alphabetically) Ariel [24], HiPAC [9, 11, 32], Ode [19], POSTGRES [40, 41], RPL [13], and Starburst [45, 46]. A number of other research projects are not described in de ...
... in products and proposed standards. Important research projects, all of which are described in this paper to some extent, include (alphabetically) Ariel [24], HiPAC [9, 11, 32], Ode [19], POSTGRES [40, 41], RPL [13], and Starburst [45, 46]. A number of other research projects are not described in de ...
ppt - UCSB Computer Science - University of California, Santa Barbara
... – Filtering super answer set could be time consuming depending on the partitions sizes ...
... – Filtering super answer set could be time consuming depending on the partitions sizes ...
In the SAS System a Database Management System?
... reposllory and making II available upon demand. Users of Iha dala are shielded from the details and pecullarilies or the compuler software and hardware by Ihe DBMS. That Is, a DBMS separates the appllcallon from Ihe data. This separalion Is a key point and will be discussed In more delall. A databas ...
... reposllory and making II available upon demand. Users of Iha dala are shielded from the details and pecullarilies or the compuler software and hardware by Ihe DBMS. That Is, a DBMS separates the appllcallon from Ihe data. This separalion Is a key point and will be discussed In more delall. A databas ...
File - ashwani goyal
... 5.9 Dynamic SQL * 156 5.10 ODBC and JDBC * 157 5.10.1 Architecture 158 5.10.2 An Example Using JDBC 159 5.11 Complex Integrity Constraints in SQL-92 * 161 5.11.1 Constraints over a Single Table 161 5.11.2 Domain Constraints 162 5.11.3 Assertions: ICs over Several Tables 163 5.12 Triggers and Active ...
... 5.9 Dynamic SQL * 156 5.10 ODBC and JDBC * 157 5.10.1 Architecture 158 5.10.2 An Example Using JDBC 159 5.11 Complex Integrity Constraints in SQL-92 * 161 5.11.1 Constraints over a Single Table 161 5.11.2 Domain Constraints 162 5.11.3 Assertions: ICs over Several Tables 163 5.12 Triggers and Active ...
CSc-340 10a
... Durability requirement — once the user has been notified that the transaction has completed (i.e., the transfer of the $50 has taken place), the updates to the database by the transaction must persist even if there are software or hardware failures. ...
... Durability requirement — once the user has been notified that the transaction has completed (i.e., the transfer of the $50 has taken place), the updates to the database by the transaction must persist even if there are software or hardware failures. ...
Developing Web-Enabled Decision Support Systems Ravindra K
... respective controls. (Bind to list box and data grid.) Execute a parameter query for second control on some event of first control. (Here we execute parameter query for data grid on selection change event of list box.) ...
... respective controls. (Bind to list box and data grid.) Execute a parameter query for second control on some event of first control. (Here we execute parameter query for data grid on selection change event of list box.) ...
... Apache Sqoop is designed for big data bulk transfers, it partitions data sets and creates Hadoop jobs to process each partition. Sqoop is the JDBC-based utility for integrating with traditional databases. A Sqoop Import allows for the movement of data into HDFS (a delimited format can be defined as ...
Oracle Exadata Storage Server X2
... allow the user to provide directives at the database table, index and segment level to ...
... allow the user to provide directives at the database table, index and segment level to ...
Terminological aspects of text retrieval
... at the time of database production: »adding subject descriptors in various languages (for instance in Pascal and Francis made by INIST) »adding abstracts in various languages (for instance the abstracts in English in INSPEC) »translation of the complete contents of the database These processes can b ...
... at the time of database production: »adding subject descriptors in various languages (for instance in Pascal and Francis made by INIST) »adding abstracts in various languages (for instance the abstracts in English in INSPEC) »translation of the complete contents of the database These processes can b ...
Chapter 14: Concurrency Control
... 2PL is needed for conflict serializability in the following sense: Given a transaction Ti that does not follow 2PL, we can find a transaction Tj that uses 2PL, and a schedule for Ti and Tj that is not conflict serializable. ...
... 2PL is needed for conflict serializability in the following sense: Given a transaction Ti that does not follow 2PL, we can find a transaction Tj that uses 2PL, and a schedule for Ti and Tj that is not conflict serializable. ...
0 Flexible and Extensible Preference Evaluation in Database Systems
... proposing new preference methods is to challenge the notion of “best” answers. Since the concept of “best” is subjective, there is theoretically no limit to the number of new preference methods that can be proposed. Given the large number of preference methods already in existence (with more on the ...
... proposing new preference methods is to challenge the notion of “best” answers. Since the concept of “best” is subjective, there is theoretically no limit to the number of new preference methods that can be proposed. Given the large number of preference methods already in existence (with more on the ...
Active Behavior in a Configurable Real-Time Database for Embedded Systems Final thesis by
... (COMET) [1], which is a configurable database platform under ongoing development. COMET has been developed using a novel software engineering technique, AspeCtual COmponent-based Real-time software Development (ACCORD) [1], which combines component-based and aspect-oriented software development in t ...
... (COMET) [1], which is a configurable database platform under ongoing development. COMET has been developed using a novel software engineering technique, AspeCtual COmponent-based Real-time software Development (ACCORD) [1], which combines component-based and aspect-oriented software development in t ...
BizTalk Server 2006: High Availability, Fault Tolerance
... Carefully choose small sets of data items (checkpoints), and avoid including unnecessary data items when defining an activity ...
... Carefully choose small sets of data items (checkpoints), and avoid including unnecessary data items when defining an activity ...
Relational model
The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.