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WHERE expression - Dixie-Net
... – Only grades table structure and table data – Useful with first class assignments – Avoids grading more advanced features (for example, queries, indexing, relations) before being covered in class – Avoids “error overload”; hides details that might be more easily handled manually ...
... – Only grades table structure and table data – Useful with first class assignments – Avoids grading more advanced features (for example, queries, indexing, relations) before being covered in class – Avoids “error overload”; hides details that might be more easily handled manually ...
UniData - Strategy 7 Corporation
... document object model (DOM) handling and Simple Object Access Protocol (SOAP) requests within UniBasic. UniData includes Java Database Connectivity (JDBC), Open Database Connectivity (ODBC), Microsoft OLE DB and ADO.NET drivers for access via standards-based tools. UniData also includes native, high ...
... document object model (DOM) handling and Simple Object Access Protocol (SOAP) requests within UniBasic. UniData includes Java Database Connectivity (JDBC), Open Database Connectivity (ODBC), Microsoft OLE DB and ADO.NET drivers for access via standards-based tools. UniData also includes native, high ...
TeXOR: Temporal XML Database on an Object
... integrated approach as the long-term solution, it is not appropriate for storing and querying temporal XML data today, for the simple reason that no such system with product quality exists. Thus, for the time to come, a stratum approach is the most adequate solution. The stratum approach also makes ...
... integrated approach as the long-term solution, it is not appropriate for storing and querying temporal XML data today, for the simple reason that no such system with product quality exists. Thus, for the time to come, a stratum approach is the most adequate solution. The stratum approach also makes ...
Fundamentals of Database Systems
... If the system crashes, we can recover to a consistent database state by examining the log and performing undo or redo as follows: 1. Because the log contains a record of every write operation that changes the value of some database item, it is possible to undo the effect of these write operations of ...
... If the system crashes, we can recover to a consistent database state by examining the log and performing undo or redo as follows: 1. Because the log contains a record of every write operation that changes the value of some database item, it is possible to undo the effect of these write operations of ...
Relational Integrity Constraints Integrity Rules: Applicable to a
... • Not included in Codd’s original definition of relations. • Not supported in initial commercial relational database systems. • Now supported in all major relational database systems. • Actually introduced in network model. Relational integrity rules ...
... • Not included in Codd’s original definition of relations. • Not supported in initial commercial relational database systems. • Now supported in all major relational database systems. • Actually introduced in network model. Relational integrity rules ...
Visual Basic and Databases
... So, if the Jet engine is so powerful and is the same engine used by Microsoft Access, why not just use Access as a DBMS instead of writing a custom Visual Basic application? There are two primary advantages to using Visual Basic as a DBMS instead of Access: 1. Your users don’t need to have Access in ...
... So, if the Jet engine is so powerful and is the same engine used by Microsoft Access, why not just use Access as a DBMS instead of writing a custom Visual Basic application? There are two primary advantages to using Visual Basic as a DBMS instead of Access: 1. Your users don’t need to have Access in ...
Backup + Restore
... Use master Exec sp_addumpdevice ‘disk’, ‘Nwindbaclog’, ‘D:\Baclup\Nwind backuplog.bak’ Backup log Northwind To NwindBaclog ...
... Use master Exec sp_addumpdevice ‘disk’, ‘Nwindbaclog’, ‘D:\Baclup\Nwind backuplog.bak’ Backup log Northwind To NwindBaclog ...
INTRODUCTION OF 3D INFORMATION IN URBAN GIS : A CONCEPTUAL...
... user’s needs for 3D information ? Or is it the users who don’t know what 3D can give them ? Usually users don’t know their 3D needs. Even if 3D needs are expressed for some applications (for example the propagation of mobile phone signal), the most urban studies are still tackled in 2D. 3D informati ...
... user’s needs for 3D information ? Or is it the users who don’t know what 3D can give them ? Usually users don’t know their 3D needs. Even if 3D needs are expressed for some applications (for example the propagation of mobile phone signal), the most urban studies are still tackled in 2D. 3D informati ...
Proceedings of - Intelligent Systems Center
... schema model. This is built (replicated) when a mobile node leaves a zone, and its corresponding data is copied to the auxiliary database. The auxiliary database and the corresponding schema is used to parse the transaction when there is no matched schema is found in the intra-zonal summary schema a ...
... schema model. This is built (replicated) when a mobile node leaves a zone, and its corresponding data is copied to the auxiliary database. The auxiliary database and the corresponding schema is used to parse the transaction when there is no matched schema is found in the intra-zonal summary schema a ...
OLAP Query Evaluation in a Database Cluster: a Performance Study
... have not used physical partitioning, but the following physical design scheme: All tables are fully replicated, and there are clustered primary key indexes on the fact tables, on the same attribute. With TPC-R, this attribute is OrderKey1. Subsequently, we refer to this attribute as partitioning att ...
... have not used physical partitioning, but the following physical design scheme: All tables are fully replicated, and there are clustered primary key indexes on the fact tables, on the same attribute. With TPC-R, this attribute is OrderKey1. Subsequently, we refer to this attribute as partitioning att ...
Ontology-based Semantic Metadata Validation Vilho Raatikka and Eero Hyv¨onen
... easier to combine two conceptual models of different databases than two logical models. It has been shown that any relational schema can be transformed into an ERdiagram if the relational schema is in an entity-relationship normal form (ERNF) [11, Ch.11.5]. By following certain rules in logical mode ...
... easier to combine two conceptual models of different databases than two logical models. It has been shown that any relational schema can be transformed into an ERdiagram if the relational schema is in an entity-relationship normal form (ERNF) [11, Ch.11.5]. By following certain rules in logical mode ...
Data Constructors: On the Integration of Rules
... of rulebased systems and the selective power of databased systems will remain where it has been comhistorically - at the point of ‘relational pleteness’ as defined by [Codd ‘721. The question of exactly what ca abilities should be added to the DBMS is open. PUllm 841 proposes an architecture using ‘ ...
... of rulebased systems and the selective power of databased systems will remain where it has been comhistorically - at the point of ‘relational pleteness’ as defined by [Codd ‘721. The question of exactly what ca abilities should be added to the DBMS is open. PUllm 841 proposes an architecture using ‘ ...
Database System Concepts, 6 th Ed
... either Tj, finished execution before Ti started, or Tj started execution after Ti finished. ...
... either Tj, finished execution before Ti started, or Tj started execution after Ti finished. ...
CHAOS - Engineering Informatics Group
... manage its own security policy. A heterogeneous information system may organize its source data as information islands, and each island is maintained distinctively from the others. This organization is becoming more pervasive for Internet services. We observe that source data maintenance and securit ...
... manage its own security policy. A heterogeneous information system may organize its source data as information islands, and each island is maintained distinctively from the others. This organization is becoming more pervasive for Internet services. We observe that source data maintenance and securit ...
CasJobs and MyDB: A Batch Query Workbench
... • A query started with the Quick button is executed synchronously, with a low maximum execution time and a limit on the amount of data returned. This mode is intended for lowoverhead queries, such as object creation or deletion, data exploration, and so on. CasJobs imposes no limit on the number of ...
... • A query started with the Quick button is executed synchronously, with a low maximum execution time and a limit on the amount of data returned. This mode is intended for lowoverhead queries, such as object creation or deletion, data exploration, and so on. CasJobs imposes no limit on the number of ...
Performance investigation into selected object persistence stores
... layer (or tiers) - usually user interface, business logic and domain object (or data) layer, each with their own design issues. In particular, the latter contains data that needs to be stored and retrieved from permanent storage. Decisions need to be made as to the most appropriate way of doing this ...
... layer (or tiers) - usually user interface, business logic and domain object (or data) layer, each with their own design issues. In particular, the latter contains data that needs to be stored and retrieved from permanent storage. Decisions need to be made as to the most appropriate way of doing this ...
presentation source
... • Done via better utilization of resources: – While one processes is doing a disk read, another can be using the CPU or reading another disk. • DANGER DANGER! Concurrency could lead to incorrectness! – Must carefully manage concurrent data access. – There’s (much!) more here than the usual OS tricks ...
... • Done via better utilization of resources: – While one processes is doing a disk read, another can be using the CPU or reading another disk. • DANGER DANGER! Concurrency could lead to incorrectness! – Must carefully manage concurrent data access. – There’s (much!) more here than the usual OS tricks ...
PDF file - Jim Gray
... 2) The primary performance metrics include the time for performing the two update functions, UF1 and UF2. Elapsed time for both will increase due to index maintenance overhead for any indexes carried on the affected tables. 3) The disk storage ratio, a secondary metric that shows the ratio of total ...
... 2) The primary performance metrics include the time for performing the two update functions, UF1 and UF2. Elapsed time for both will increase due to index maintenance overhead for any indexes carried on the affected tables. 3) The disk storage ratio, a secondary metric that shows the ratio of total ...
CHAOS: An Active Security Mediation System 1 David Liu , Kincho Law
... manage its own security policy. A heterogeneous information system may organize its source data as information islands, and each island is maintained distinctively from the others. This organization is becoming more pervasive for Internet services. We observe that source data maintenance and securit ...
... manage its own security policy. A heterogeneous information system may organize its source data as information islands, and each island is maintained distinctively from the others. This organization is becoming more pervasive for Internet services. We observe that source data maintenance and securit ...
DATABASE TRANSACTIONS
... implementation of tasks that could fail Also essential for databases with concurrent access! An operation consisting of multiple reads may also need to see a single, consistent set of values ¤ Reads should also be performed “as a unit” ...
... implementation of tasks that could fail Also essential for databases with concurrent access! An operation consisting of multiple reads may also need to see a single, consistent set of values ¤ Reads should also be performed “as a unit” ...
Document
... value-based indexes are useful for XML, as well as text index and structural index Comments and processing instructions should be preserved when documents are stored The result of a query against an XML database should be XML ...
... value-based indexes are useful for XML, as well as text index and structural index Comments and processing instructions should be preserved when documents are stored The result of a query against an XML database should be XML ...
Chapter 22: Distribute Databases
... Every site is ready to commit if instructed to do so Phase 2 of 2PC is split into 2 phases, Phase 2 and Phase 3 of 3PC In phase 2 coordinator makes a decision as in 2PC (called the pre-commit decision) and records it in multiple (at least K) sites In phase 3, coordinator sends commit/abort mes ...
... Every site is ready to commit if instructed to do so Phase 2 of 2PC is split into 2 phases, Phase 2 and Phase 3 of 3PC In phase 2 coordinator makes a decision as in 2PC (called the pre-commit decision) and records it in multiple (at least K) sites In phase 3, coordinator sends commit/abort mes ...
Versant Object Database
![](https://commons.wikimedia.org/wiki/Special:FilePath/Versant_logo_2007.png?width=300)
Versant Object Database (VOD) is an object database software product developed by Versant Corporation.The Versant Object Database enables developers using object oriented languages to transactionally store their information by allowing the respective language to act as the Data Definition Language (DDL) for the database. In other words, the memory model is the database schema model.In general, persistence in VOD in implemented by declaring a list of classes, then providing a transaction demarcation application programming interface to use cases. Respective language integrations adhere to the constructs of that language, including syntactic and directive sugars.Additional APIs exist, beyond simple transaction demarcation, providing for the more advanced capabilities necessary to address practical issues found when dealing with performance optimization and scalability for systems with large amounts of data, many concurrent users, network latency, disk bottlenecks, etc.