SERF: ODMG-Based Generic Re
... Object Design Inc.'s 100% Pure Java PSE as its persistent store. As part of our development e ort we have also built on top of PSE, a schema evolution facility, Schema Evolution Primitive Manager, the Schema Repository and OQL Query Engine which are not directly a part of the SERF system. Figure 1 ...
... Object Design Inc.'s 100% Pure Java PSE as its persistent store. As part of our development e ort we have also built on top of PSE, a schema evolution facility, Schema Evolution Primitive Manager, the Schema Repository and OQL Query Engine which are not directly a part of the SERF system. Figure 1 ...
Flat Files and Relational Databases Presentation
... Customer details held in two different files. Data entered more than once, therefore time, space and money are wasted. Loss of data integrity: ...
... Customer details held in two different files. Data entered more than once, therefore time, space and money are wasted. Loss of data integrity: ...
Authentication
... Concurrency Control Concurrency control: ensure that one user’s work does not inappropriately influence another user’s work No single concurrency control technique is ideal for all circumstances Trade-offs need to be made between level of protection and throughput ...
... Concurrency Control Concurrency control: ensure that one user’s work does not inappropriately influence another user’s work No single concurrency control technique is ideal for all circumstances Trade-offs need to be made between level of protection and throughput ...
Chapter 9
... Functions (Cont.) Database system may also allow the use of functions written in other languages such as C or C++ Benefits: more efficient for many operations, more ...
... Functions (Cont.) Database system may also allow the use of functions written in other languages such as C or C++ Benefits: more efficient for many operations, more ...
Kroenke-DBP-e10-PPT-Chapter09
... transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately • Two-phased locking is one of the techniques used to achieve serializability ...
... transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately • Two-phased locking is one of the techniques used to achieve serializability ...
Concepts for Object-Oriented Databases
... direct correspondence between real-world and database objects so that objects do not lose their integrity and identity and can easily be identified and operated upon Object: Two components: state (value) and behavior (operations). Similar to program variable in programming language, except that it ...
... direct correspondence between real-world and database objects so that objects do not lose their integrity and identity and can easily be identified and operated upon Object: Two components: state (value) and behavior (operations). Similar to program variable in programming language, except that it ...
transactions_and_recovery
... All-or-nothing, no partial results. An event either happens and is committed or fails and is rolled back. e.g. in a money transfer, debit one account, credit the other. Either both debiting and crediting operations succeed, or neither of them do. Transaction failure is called Abort Commit and ab ...
... All-or-nothing, no partial results. An event either happens and is committed or fails and is rolled back. e.g. in a money transfer, debit one account, credit the other. Either both debiting and crediting operations succeed, or neither of them do. Transaction failure is called Abort Commit and ab ...
Updatable Views in Object-Oriented Database Systems
... proprietary solutions written in lower-level languages. For instance, such an approach is assumed in OMG CORBA [OMG95], where interfaces in IDL can be considered virtual views, but mappings between stored and virtual objects (i.e. adaptors and wrappers) are to be written in a regular programming lan ...
... proprietary solutions written in lower-level languages. For instance, such an approach is assumed in OMG CORBA [OMG95], where interfaces in IDL can be considered virtual views, but mappings between stored and virtual objects (i.e. adaptors and wrappers) are to be written in a regular programming lan ...
A Taxonomy of Partitioned Replicated Cloud
... replica management in these systems. Since there are well-known techniques for both transaction management and replica management, the challenge in designing a distributed replicated database system is how to combine techniques to arrive at an effective design that will address both problems. Thus, ...
... replica management in these systems. Since there are well-known techniques for both transaction management and replica management, the challenge in designing a distributed replicated database system is how to combine techniques to arrive at an effective design that will address both problems. Thus, ...
Can this query be executed and is it useful (according to the
... B. It uses DataSet to represent data in memory that can store data from multiple tables and multiple sources. ...
... B. It uses DataSet to represent data in memory that can store data from multiple tables and multiple sources. ...
Distributed Databases
... Features a user of resources, or a client, and a provider of resources, or a server Can be used to implement a DBMS in which the client is the TP and the server is the DP The client interacts with the end user and sends a request to the server. The server receives, schedules and executes the ...
... Features a user of resources, or a client, and a provider of resources, or a server Can be used to implement a DBMS in which the client is the TP and the server is the DP The client interacts with the end user and sends a request to the server. The server receives, schedules and executes the ...
Lab 1 File - Personal page
... An entity is a person, place, or event about which data will be collected and stored. An attribute is a characteristic of an entity. For example, a STUDENT entity would be described by attributes such as student first name, student last name, faculty number, student address. A relationship describes ...
... An entity is a person, place, or event about which data will be collected and stored. An attribute is a characteristic of an entity. For example, a STUDENT entity would be described by attributes such as student first name, student last name, faculty number, student address. A relationship describes ...
Chapter 13
... 13.6 Database Access with JDBC/MySQL (continued) - For MySQL and the cars database, which resides on the user machine, the reference to the host and database is: ...
... 13.6 Database Access with JDBC/MySQL (continued) - For MySQL and the cars database, which resides on the user machine, the reference to the host and database is: ...
(Relational) Databases
... "*" asks for all attributes from the relevant rows. Lets experiment with world and taxa databases. ...
... "*" asks for all attributes from the relevant rows. Lets experiment with world and taxa databases. ...
Introduction to Persistent Storage, Concurrency Control and
... but ignore write-after-reads (READ followed by WRITE) dependencies. ...
... but ignore write-after-reads (READ followed by WRITE) dependencies. ...
Creating Databases
... – Example: • If the required maximum number of users connected to an instance at one time is 100, the setting of PROCESSES may need to be 107 • PROCESSES = Background + Users ...
... – Example: • If the required maximum number of users connected to an instance at one time is 100, the setting of PROCESSES may need to be 107 • PROCESSES = Background + Users ...
3. Crosscutting Concerns in Database Systems
... while for another physical conversion may be essential. The choice is dictated by “local” organisational needs and at times custom variations of standard instance adaptation models can be required. The choice of instance adaptation approach may even vary from one application to another within the sa ...
... while for another physical conversion may be essential. The choice is dictated by “local” organisational needs and at times custom variations of standard instance adaptation models can be required. The choice of instance adaptation approach may even vary from one application to another within the sa ...
OWL2 based Data Cleansing Using Conditional Exclusion Dependencies
... data sources through a mediating ontology. Most research conducted in this area tackles ontology expressivity, computational efficiency of reasoning services and inferences associated to query answering. In this paper, we argue that data quality and data cleansing are domains where OBDA could contri ...
... data sources through a mediating ontology. Most research conducted in this area tackles ontology expressivity, computational efficiency of reasoning services and inferences associated to query answering. In this paper, we argue that data quality and data cleansing are domains where OBDA could contri ...
Microsoft Office 2003
... 1. Group Activity: Encourage students to think about creating a database that will store information about students. Reemphasize the importance of a good database design. Divide students into groups of 2 or 3. Ask each group to design a table that will contain information about students. Refer stude ...
... 1. Group Activity: Encourage students to think about creating a database that will store information about students. Reemphasize the importance of a good database design. Divide students into groups of 2 or 3. Ask each group to design a table that will contain information about students. Refer stude ...
Database Replication - Database Systems Journal
... your tables, but also your solution's objects. If you make changes to the design of the database, the changes are transmitted during the next synchronization; you don't have to distribute complete new versions of the software. • Back up data. At first glance, database replication might appear to be ...
... your tables, but also your solution's objects. If you make changes to the design of the database, the changes are transmitted during the next synchronization; you don't have to distribute complete new versions of the software. • Back up data. At first glance, database replication might appear to be ...
Versant Object Database
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.