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29.6.1 ACID属性
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29.6.1 ACID属性
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165756.htm'>29.4 组件服务管理工具</a></div><div style='float:right;width:49%'>·<a href='100165757.htm'>29.5 客户应用程序</a></div><div style='float:left;width:49%'>·<a href='100165758.htm'>29.6 事务处理</a></div><div style='float:right;width:49%'>·<a href='100165760.htm'>29.6.2 事务处理的属性</a></div><div style='float:left;width:49%'>·<a href='100165761.htm'>29.6.3 事务处理的结果</a></div><div style='float:right;width:49%'>·<a href='100165762.htm'>29.6.4 示例应用程序(1)</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;margin-left:
0cm'><span lang=EN-US>29.6.1 ACID</span><span style='font-family:黑体'>属性</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>事务处理可以使用</span><span
lang=EN-US>ACID</span><span style='font-family:宋体'>属性描述。</span><span
lang=EN-US>ACID</span><span style='font-family:宋体'>是</span><span lang=EN-US>Atomicity</span><span
style='font-family:宋体'>、</span><span lang=EN-US>Consistency</span><span
style='font-family:宋体'>、</span><span lang=EN-US>Isolation</span><span
style='font-family:宋体'>和</span><span lang=EN-US>Durability</span><span
style='font-family:宋体'>的首字母缩写。</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
lang=EN-US>Atomicity</span><span style='font-family:宋体'>：表示一个工作单元。在事务处理中，要么整个工作单元都成功完成，要么都不完成。</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
lang=EN-US>Consistency</span><span style='font-family:宋体'>：在执行事务处理后，数据库的状态必须有效、一致。</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
lang=EN-US>Isolation</span><span style='font-family:宋体'>：表示并发进行的事务处理独立于状态的变化。在事务处理未完成时，事务处理</span><span
lang=EN-US>A</span><span style='font-family:宋体'>看不到事务处理</span><span lang=EN-US>B</span><span
style='font-family:宋体'>中已变化的状态。</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
lang=EN-US>Durability</span><span style='font-family:宋体'>：在事务处理完成后，必须以可持久的方式存储起来。如果关闭电源或服务器崩溃，这些状态在重新启动时必须恢复。</span></p>
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<div style='float:left;width:49%'>·<a href='100165756.htm'>29.4 组件服务管理工具</a></div><div style='float:right;width:49%'>·<a href='100165757.htm'>29.5 客户应用程序</a></div><div style='float:left;width:49%'>·<a href='100165758.htm'>29.6 事务处理</a></div><div style='float:right;width:49%'>·<a href='100165760.htm'>29.6.2 事务处理的属性</a></div><div style='float:left;width:49%'>·<a href='100165761.htm'>29.6.3 事务处理的结果</a></div><div style='float:right;width:49%'>·<a href='100165762.htm'>29.6.4 示例应用程序(1)</a></div></div>
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