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*goodputfrequencyamplitude*throughputcrosstalk*bandwidth
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What tasks does an operating system perform?
The instructions in these files inform the various components of the computer system about such tasks as recognition of components, communications, data processing, internal data transfer, and memory management.
What has the author Ed Skoudis written?
Ed Skoudis has written: 'Counter Hack' -- subject(s): Computer networks, Data protection, Security measures 'Malware' -- subject(s): Computer crimes, Computer networks, Computer security, Security measures
What has the author Thomas R Peltier written?
Thomas R. Peltier has written: 'Policies & procedures for data security' -- subject(s): Electronic data processing departments, Security measures, Computer security 'Complete Guide to CISM Certification' 'Information security fundamentals' -- subject(s): Computer security, Data protection, Computer Technology, Nonfiction, OverDrive 'Information security risk analysis' -- subject(s): Computer networks, Security measures, Computer security, Risk assessment 'Information Security Fundamentals On-line Self-study Course'
What are the advantages of multi-tasking operating systems?
multi tasking operating system saves time. increases uses productivity. easy data transfer to diffrent windows increases the cpu utilisation
What are the different approaches to database design?
DBMS Three-Schema Architecture and Data Independence WHAT IS DBMS ? - To be able to carry out operations like insertion, deletion and retrieval, the database needs to be managed by a substantial piece of software; this software is usually called a Database Management System(DBMS). - A DBMS is usually a very large software package that enables many different tasks including the provision of facilities to enable the user to access and modify information in the database. - Data Description Languages (DDL) and Data Manipulation Languages (DML) are needed for manipulating and retrieving data stored in the DBMS. These languages are called respectively. An architecture for database systems, called the three-schema architecture was proposed to help achieve and visualize the important characteristics of the database approach. THE THREE-SCHEMA ARCHITECTURE: The goal of the three-schema architecture is to separate the user applications and the physical database. In this architecture, schemas can be defined at 3 levels : 1. Internal level or Internal schema : Describes the physical storage structure of the database. The internal schema uses a physical data model and describes the complete details of data storage and access paths for the database. 2. Conceptual level or Conceptual schema : Describes the structure of the whole database for a community of users. It hides the details of physical storage structures and concentrates on describing entities, data types, relationships, user operations, and constraints. Implementation data model can be used at this level. 3. External level or External schema : It includes a number of external schemas or user views. Each external schema describes the part of the database that a particular user is interested in and hides the rest of the database from user. Implementation data model can be used at this level. IMPORTANT TO REMEMBER : Data and meta-data - three schemas are only meta-data(descriptions of data). - data actually exists only at the physical level. Mapping - DBMS must transform a request specified on an external schema into a request against the conceptual schema, and then into the internal schema. - requires information in meta-data on how to accomplish the mapping among various levels. - overhead(time-consuming) leading to inefficiencies. - few DBMSs have implemented the full three-schema architecture. DATA INDEPENDENCE The disjointing of data descriptions from the application programs (or user-interfaces) that uses the data is called data independence. Data independence is one of the main advantages of DBMS. The three-schema architecture provides the concept of data independence, which means that upper-levels are unaffected by changes to lower-levels. The three schemas architecture makes it easier to achieve true data independence. There are two kinds of data independence. - Physical data independence * The ability to modify the physical scheme without causing application programs to be rewritten. * Modifications at this level are usually to improve performance. - Logical data independence * The ability to modify the conceptual scheme without causing application programs to be rewritten. * Usually done when logical structure of database is altered. Logical data independence is harder to achieve as the application programs are usually heavily dependent on the logical structure of the data. An analogy is made to abstract data types in programming languages.
Following measures the actual data transfer rate over a medium?
Throughput
What are three measures of data?
*goodputfrequencyamplitude*throughputcrosstalk*bandwidth
What type of data transfer is carried out using a USB port?
The type of data transfer that is carried out using a USB port are varied. Some of the types of data transfer include bulk data transfer, isochronous data transfer and interrupt data transfer among others.
What is the actual speed of data transfer on a network?
less than the data transfer rate
What is the data type that measures the outcome of a study?
The data type that measures the outcome of a study is quantitative data.
What do kilobits-per-sceond measure?
Kilobits per second, or kbps is a measure used in computer technology. It measures the rate of data transfer on computers.
What is the slowest device for a data transfer?
slowest device for data transfer
What is Parallel Data transfer?
Parallel data transfer is transferring multiple bits of data at a time.
Data going into the computer is called?
incomming data, data transfer? i would use data transfer hope this helps.
What are the differences between simple calorimeter and bomb calorimeter?
bomb calorimeter measures heat transfer at constant while the cup measures at constant pressure.
What company provides the service of data transfer?
There are many companies that provide the service of data transfer. Some of these companies include Talend, EVault Premium Data Transfer Services, and Roler Data Transfer Services Incorporated.
What are the Different types of data transfer instructions?
1.simple i/o: 2.programmed i/o: a) synchronous data transfer b) asynchronous data transfer c) interrupt driven data transfer 3.Direct memory access data transfer a) burst mode b) cycle stealing mode
