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p3.html
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</html>
<head>
<title>Data Base</Basefont></title>
</head>
<body
</body>
<h1>Data Base</h1>
<h2>links</h2>
<ul><a href=index.html class="href"> *main bage</a></ul>
<ul><a href="p1.html" class="herf">database systems introduction</a></ul>
<ul><a href="p2.html" class="herf">components and types</a></ul>
<ul><a href="p3.html" class="herf">database systems table</a></ul>
<ul><a href="p4.html" class="herf">database systems Applications</a></ul>
<h2>Database table</h2>
<table style="width:100%">
<tr>
<th><h3>Advantages</h3> </th>
<th><h3>Disadvantages</h3> </th>
</tr>
<tr>
<td><h4>Reduced data redundancy</h4> </td>
<td><h4>Database systems are complex, difficult, and time-consuming to design</h4> </td>
</tr>
<tr>
<td><h4>Reduced updating errors and increased consistency</h4> </td>
<td><h4>Substantial hardware and software start-up costs</h4> </td>
</tr>
<tr>
<td><h4>Greater data integrity and independence from applications programs</h4> </td>
<td><h4>Damage to database affects virtually all applications programs</h4></td>
</tr>
<tr>
<td><h4>Improved data access to users through use of host and query languages</h4></td>
<td><h4>Extensive conversion costs in moving form a file-based system to a database system</h4></td>
</tr>
<tr>
<td><h4>Improved data security</h4></td>
<td><h4>Initial training required for all programmers and users</h4></td>
</tr>
</table>
</body>
</html>