fileionet - CIS 338: .NET File Handling Dr. Ralph D....

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CIS 338: .NET File Handling Dr. Ralph D. Westfall March, 2009
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Data Storage Is Fundamental computers need to store data to work with it memory (RAM) is fast but transient data is lost when computer is turned off storage devices are slow but persistent (much more permanent) diskette, hard drive, tape, CD-ROM, DVD
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File vs. Database small size few fields one table updated whenever few users local machine no calculations no sorting large size many fields many tables updated a lot many users network complex functions lot of sorting
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File Organization "Hierarchy" a hierarchy is like an outline from top down (in a "flat" file): file has records (1 or more), which have fields (1 or more), which are made up of character(s) (bytes), which are made up of bits (0s and/or 1s) what's above the top?
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File Contents data accounting data in "flat" files data in database files documents in word processor files images in graphics files HTML, email, web services on servers stored programs in files some early computers did not use files for their programs ( Altair )
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fileionet - CIS 338: .NET File Handling Dr. Ralph D....

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