distributed_db_arch_replication
... a transaction will perform slowly if it requires data from different sites, unless the network connecting them is very fast a transaction performing much replication of updates will perform slowly if there is frequent contention for resources (locking) frequently used transactions should be optimise ...
... a transaction will perform slowly if it requires data from different sites, unless the network connecting them is very fast a transaction performing much replication of updates will perform slowly if there is frequent contention for resources (locking) frequently used transactions should be optimise ...
King Mongkut`s University of Technology North Bangkok Faculty of
... Lecture 1: Course Introduction Lecture 2: Concepts of Database Systems and ...
... Lecture 1: Course Introduction Lecture 2: Concepts of Database Systems and ...
Transaction
... A DBMS is expected to support “ACID transactions,” processes that are: Atomic : Either the whole process is done or none is. Consistent : Database constraints are preserved. Isolated : It appears to the user as if only one process executes at a time. Durable : Effects of a process do not ge ...
... A DBMS is expected to support “ACID transactions,” processes that are: Atomic : Either the whole process is done or none is. Consistent : Database constraints are preserved. Isolated : It appears to the user as if only one process executes at a time. Durable : Effects of a process do not ge ...
SSSS - Computer Science
... Recovery from transaction failures usually means that the database is restored to some state from the past so that a correct state - close to the time of failure - can be reconstructed from that past state. ...
... Recovery from transaction failures usually means that the database is restored to some state from the past so that a correct state - close to the time of failure - can be reconstructed from that past state. ...
DBMS Overview
... that must be executed atomically and isolation from one another. • Each Query or modification action is a transaction by itself. • Execution of a transactions must be ...
... that must be executed atomically and isolation from one another. • Each Query or modification action is a transaction by itself. • Execution of a transactions must be ...
Database systems
... Multiple tables related by common fields Uses controlled redundancy to create fields that provide linkage relationships between tables in the database These fields are called foreign keys – the secret to a relational database A foreign key is a field, or group of fields, in one table that is the ...
... Multiple tables related by common fields Uses controlled redundancy to create fields that provide linkage relationships between tables in the database These fields are called foreign keys – the secret to a relational database A foreign key is a field, or group of fields, in one table that is the ...
Database systems
... Multiple tables related by common fields Uses controlled redundancy to create fields that provide linkage relationships between tables in the database These fields are called foreign keys – the secret to a relational database A foreign key is a field, or group of fields, in one table that is the ...
... Multiple tables related by common fields Uses controlled redundancy to create fields that provide linkage relationships between tables in the database These fields are called foreign keys – the secret to a relational database A foreign key is a field, or group of fields, in one table that is the ...
Access Databases
... Table Design Basics Include necessary data Store data in smallest parts Do not use calculated fields ...
... Table Design Basics Include necessary data Store data in smallest parts Do not use calculated fields ...
Database management system
... ER Diagram A graphical representation of an ER model Cardinality constraint The number of relationships that may exist at one time among entities in an ER diagram ...
... ER Diagram A graphical representation of an ER model Cardinality constraint The number of relationships that may exist at one time among entities in an ER diagram ...
Summary on Chapter 1
... Controlling redundancy in data storage and in development and maintenance efforts. o Sharing of data among multiple users. Restricting unauthorized access to data. Providing persistent storage for program Objects Providing Storage Structures (e.g. indexes) for efficient Query Processing Providing ba ...
... Controlling redundancy in data storage and in development and maintenance efforts. o Sharing of data among multiple users. Restricting unauthorized access to data. Providing persistent storage for program Objects Providing Storage Structures (e.g. indexes) for efficient Query Processing Providing ba ...
Chapter 4: Database Management
... – An attribute or combination of attributes – Uniquely identifies each record ...
... – An attribute or combination of attributes – Uniquely identifies each record ...
Fundamentals of Game Design, 2nd Edition
... Completing the exercises with individual efforts unless told otherwise Following the rules set by the responsibles for the course and the implementation/lab. studies HONESTY !!! Organizational Issues ...
... Completing the exercises with individual efforts unless told otherwise Following the rules set by the responsibles for the course and the implementation/lab. studies HONESTY !!! Organizational Issues ...
Applied Database Techniques
... Brief description of the content of the course (Catalog Description) - This course covers database query languages, information management concepts and fundamentals, data organization, data modeling, managing the database environment, special-purpose databases, and other topics. Rational for studyin ...
... Brief description of the content of the course (Catalog Description) - This course covers database query languages, information management concepts and fundamentals, data organization, data modeling, managing the database environment, special-purpose databases, and other topics. Rational for studyin ...
Down load the poster
... The first stage of the project was requirement analysis. Before the database schema was designed, before the interface was laid out, and before any code was written, the requirements had to be thoroughly defined and understood. Since the same database serves different user groups with different expe ...
... The first stage of the project was requirement analysis. Before the database schema was designed, before the interface was laid out, and before any code was written, the requirements had to be thoroughly defined and understood. Since the same database serves different user groups with different expe ...
Chapter 15
... 1. For each data item Q, if transaction Ti reads the initial value of Q in schedule S, then transaction Ti must, in schedule S´, also read the initial value of Q. 2. For each data item Q if transaction Ti executes read(Q) in schedule S, and that value was produced by transaction Tj (if any), then tr ...
... 1. For each data item Q, if transaction Ti reads the initial value of Q in schedule S, then transaction Ti must, in schedule S´, also read the initial value of Q. 2. For each data item Q if transaction Ti executes read(Q) in schedule S, and that value was produced by transaction Tj (if any), then tr ...
Database Connectivity PowerPoint Slides
... OBJdbConnection.Execute(strSQL) OBJdbConnection.Close ...
... OBJdbConnection.Execute(strSQL) OBJdbConnection.Close ...
ppt - EECS Instructional Support Group Home Page
... sequence of database actions (reads/writes). • Each transaction, executed completely, must take the DB between consistent states. • Users can specify simple integrity constraints on the data. The DBMS enforces these. – Beyond this, the DBMS does not understand the semantics of the data. – Ensuring t ...
... sequence of database actions (reads/writes). • Each transaction, executed completely, must take the DB between consistent states. • Users can specify simple integrity constraints on the data. The DBMS enforces these. – Beyond this, the DBMS does not understand the semantics of the data. – Ensuring t ...
CS511 Advanced Database Management Systems
... granted now, was deemed impossible to implement and difficult to use in its early days. But-- Quoting Jim Gray: These innovations give one of the best examples of research prototypes turning into products. The relational model, parallel database systems, active databases, and object-relational datab ...
... granted now, was deemed impossible to implement and difficult to use in its early days. But-- Quoting Jim Gray: These innovations give one of the best examples of research prototypes turning into products. The relational model, parallel database systems, active databases, and object-relational datab ...
ArangoDB — Is Multi-Model the Future of NoSQL? 4 November 2014
... that is executed in the DB server for high performance. This is formalised by the Foxx framework, which allows to implement complex, user-defined APIs with direct access to the DB engine. Very flexible and secure authentication schemes can be implemented conveniently by the user in JavaScript. Because ...
... that is executed in the DB server for high performance. This is formalised by the Foxx framework, which allows to implement complex, user-defined APIs with direct access to the DB engine. Very flexible and secure authentication schemes can be implemented conveniently by the user in JavaScript. Because ...
Week1-DatabaseIntroduction - Cardiff Biodiversity Informatics
... A DBMS usually also includes, in order of increasing userfriendliness: 1. Database “drivers” 2. APIs (application program interface modules, so that the driver(s) can be called from, say, Perl, Python or Java) 3. Other import & export modules, etc. (to make it easier for programs to store, retrieve ...
... A DBMS usually also includes, in order of increasing userfriendliness: 1. Database “drivers” 2. APIs (application program interface modules, so that the driver(s) can be called from, say, Perl, Python or Java) 3. Other import & export modules, etc. (to make it easier for programs to store, retrieve ...