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| The percentage of time that a system is capable of serving its intended function. amount of time that it needs downtime |
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used to calculate the probability of failure for a single solution component. One measure used to define a component or system's reliability is mean time between failures (MTBF). MTBF is the average time interval, usually expressed in thousands or tens of thousands of hours (sometimes called power-on hours or POH), that elapses before a component fails and requires service. MTBF is calculated by using the following equation:
MTBF = (total elapsed time - sum of downtime)/number of failures
A system is more reliable if it is fault tolerant. Fault tolerance is the ability of a system to continue functioning when part of the system fails. Fault tolerance is achieved by designing the system with a high degree of hardware redundancy. If any single component fails, the redundant component takes its place with no appreciable downtime.
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| facts used by programs to produce useful information |
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| machinery, computer, cpu, and support equipments |
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| computer programs and manuals, set of instructions, that direct circuitry in hardware |
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| is the transmission of signals over a distance for the purpose of communication |
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| a 'bridge' between the business world and computer science |
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| is a set of information which process the data transaction in database system that monitors transaction programs (a special kind of program). |
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| Management Information System |
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| Management information systems are distinct from regular information systems in that they are used to analyze other information systems applied in operational activities in the organization. |
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Term
Decision Support System
(EIS/DSS) |
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| is a class of information systems (including but not limited to computerized systems) that support business and organizational decision-making activities. A properly designed DSS is an interactive software-based system intended to help decision makers compile useful information from a combination of raw data, documents, personal knowledge, or business models to identify and solve problems and make decisions. |
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| Chief Information Officer |
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| Developer in the computer world |
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| The architect or Designer |
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| also a builder, just another name for programmer |
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| Equivelant to General Contractor |
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| different chips on the motherboard of the computer controlling different functions |
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| random Access memory, volotile, but also very fast |
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| Capacity, Speed, and Cost, all in direct opposition to eachother |
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| an intermediary between physical RAM and CPU, also volatile |
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| and extension to physical memory, much slower than ram |
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| put in systems to cut costs, is able to perform multiple functions but is very inflexible |
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| an artificial language designed to express computations that can be performed by a computer |
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| available for use without charge, usually not the whole version of the softwaree |
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| many files combined in different ways for complex software |
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| a free download trial version, also not usually the complete package |
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| operation system, speaks to the computer in a language that it can understand, and makes it usable for peopel |
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| such as windows, microsoft, adobe etx. |
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| system software desingend to help analyze configure, optimize and maintain, such as defragmenting the hard drive etc. |
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| how well an application can grow to meet increasing performance demands |
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| ability to reuse existing code, when transfered from one place to another, kind of like compatibility |
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| performing preliminary study to measure a projects viablilty |
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| how many different kinds of applications can it perform |
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| Integrated collection of logically related records or files |
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| plain text or binary file, oner record per line |
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| series of unordered tables related together |
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| or relations, used to represent things in real life |
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| a single piece of information |
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| Unique Identifier for each rule of Data |
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| A foreign key is a column in a table used to reference a primary key in another table. |
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| how each piece of data is related to the other. |
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| real world objects distinguisable from other objects. such as a student or a building |
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| process of analyzing data and making it useful |
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| grouping according to logical relationships or consumer preferences |
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| retrieving data from the data base |
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| what do you need to get out of the system |
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Describes one entity
no duplicate rows always a primary key
columns are unordered
rows are unordered |
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| all column values must be atomic |
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| in 1NF and every nonkey column in fully dependant on the entire primary key |
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| in 2NF all non key columns are mutually independant |
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| process of simplifying the design of database so it achieves optimum structure |
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| important part of DB integrity, helps to organize and sift through data |
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| forbids nulls in primary key column. no unmatched foreign key |
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| relationships between data tables, defines how each is linked to eachother, one to one, many to many, or one to many and so on. |
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| high level description of Data and Constraints |
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| direct DBMS into choice of underlying data layout in hopes of optimizing performance. |
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