$5.00 Complete answer
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- Posted on Nov 03, 2008 at 4:10:14PM
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Preview: ... to gain speed at the price of flexibility.<br><br>In 1960, Charles Bachman developed the first database management system (DBMS) which two key data models arose: the network model (developed by CODASYL) followed by the hierarchical model (as implemented in IMS). These were later usurped by the relational model, which was contemporary with the so-called flat model designed for very small tasks. Another contemporary of the relational model is the object-oriented database (OODB).< ...
The full tutorial is about 372 words long .
$5.00 IT210 - Week 7 DQ 2
- This tutorial was purchased 6 times and rated A+ by students like you.
- Posted on Nov 03, 2008 at 9:44:19PM
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Preview: ... in most cases, must be processed sequentially so that if you need the last record in the file, you must read all those that come before. In an RDBMS, records (or "rows" are typically read directly by means of an index.<br><br>When data is stored in a flat file, programming must be d ...
The full tutorial is about 234 words long .
